stop tracking node_modules/

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diff --git a/node_modules/napi-build-utils/index.js b/node_modules/napi-build-utils/index.js
deleted file mode 100644
index d143d5d..0000000
--- a/node_modules/napi-build-utils/index.js
+++ /dev/null
@@ -1,214 +0,0 @@
-'use strict'
-// Copyright (c) 2018 inspiredware
-
-var path = require('path')
-var pkg = require(path.resolve('package.json'))
-
-var versionArray = process.version
-  .substr(1)
-  .replace(/-.*$/, '')
-  .split('.')
-  .map(function (item) {
-    return +item
-  })
-
-/**
- *
- * A set of utilities to assist developers of tools that build
- * [N-API](https://nodejs.org/api/n-api.html#n_api_n_api) native add-ons.
- *
- * The main repository can be found
- * [here](https://github.com/inspiredware/napi-build-utils#napi-build-utils).
- *
- * @module napi-build-utils
- */
-
-/**
- * Implements a consistent name of `napi` for N-API runtimes.
- *
- * @param {string} runtime The runtime string.
- * @returns {boolean}
- */
-exports.isNapiRuntime = function (runtime) {
-  return runtime === 'napi'
-}
-
-/**
- * Determines whether the specified N-API version is supported
- * by both the currently running Node instance and the package.
- *
- * @param {string} napiVersion The N-API version to check.
- * @returns {boolean}
- */
-exports.isSupportedVersion = function (napiVersion) {
-  var version = parseInt(napiVersion, 10)
-  return version <= exports.getNapiVersion() && exports.packageSupportsVersion(version)
-}
-
-/**
- * Determines whether the specified N-API version is supported by the package.
- * The N-API version must be present in the `package.json`
- * `binary.napi_versions` array.
- *
- * @param {number} napiVersion The N-API version to check.
- * @returns {boolean}
- * @private
- */
-exports.packageSupportsVersion = function (napiVersion) {
-  if (pkg.binary && pkg.binary.napi_versions &&
-      pkg.binary.napi_versions instanceof Array) { // integer array
-    for (var i = 0; i < pkg.binary.napi_versions.length; i++) {
-      if (pkg.binary.napi_versions[i] === napiVersion) return true
-    };
-  };
-  return false
-}
-
-/**
- * Issues a warning to the supplied log if the N-API version is not supported
- * by the current Node instance or if the N-API version is not supported
- * by the package.
- *
- * @param {string} napiVersion The N-API version to check.
- * @param {Object} log The log object to which the warnings are to be issued.
- * Must implement the `warn` method.
- */
-exports.logUnsupportedVersion = function (napiVersion, log) {
-  if (!exports.isSupportedVersion(napiVersion)) {
-    if (exports.packageSupportsVersion(napiVersion)) {
-      log.warn('This Node instance does not support N-API version ' + napiVersion)
-    } else {
-      log.warn('This package does not support N-API version ' + napiVersion)
-    }
-  }
-}
-
-/**
- * Issues warnings to the supplied log for those N-API versions not supported
- * by the N-API runtime or the package.
- *
- * Note that this function is specific to the
- * [`prebuild`](https://github.com/prebuild/prebuild#prebuild) package.
- *
- * `target` is the list of targets to be built and is determined in one of
- * three ways from the command line arguments:
- * (1) `--target` specifies a specific target to build.
- * (2) `--all` specifies all N-API versions supported by the package.
- * (3) Neither of these specifies to build the single "best version available."
- *
- * `prebuild` is an array of objects in the form `{runtime: 'napi', target: '2'}`.
- * The array contains the list of N-API versions that are supported by both the
- * package being built and the currently running Node instance.
- *
- * The objective of this function is to issue a warning for those items that appear
- * in the `target` argument but not in the `prebuild` argument.
- * If a specific target is supported by the package (`packageSupportsVersion`) but
- * but note in `prebuild`, the assumption is that the target is not supported by
- * Node.
- *
- * @param {(Array<string>|string)} target The N-API version(s) to check. Target is
- * @param {Array<Object>} prebuild A config object created by the `prebuild` package.
- * @param {Object} log The log object to which the warnings are to be issued.
- * Must implement the `warn` method.
- * @private
- */
-exports.logMissingNapiVersions = function (target, prebuild, log) {
-  if (exports.getNapiBuildVersions()) {
-    var targets = [].concat(target)
-    targets.forEach(function (napiVersion) {
-      if (!prebuildExists(prebuild, napiVersion)) {
-        if (exports.packageSupportsVersion(parseInt(napiVersion, 10))) {
-          log.warn('This Node instance does not support N-API version ' + napiVersion)
-        } else {
-          log.warn('This package does not support N-API version ' + napiVersion)
-        }
-      }
-    })
-  } else {
-    log.error('Builds with runtime \'napi\' require a binary.napi_versions ' +
-              'property on the package.json file')
-  }
-}
-
-/**
- * Determines whether the specified N-API version exists in the prebuild
- * configuration object.
- *
- * Note that this function is specific to the `prebuild` and `prebuild-install`
- * packages.
- *
- * @param {Object} prebuild A config object created by the `prebuild` package.
- * @param {string} napiVersion The N-APi version to be checked.
- * @return {boolean}
- * @private
- */
-var prebuildExists = function (prebuild, napiVersion) {
-  if (prebuild) {
-    for (var i = 0; i < prebuild.length; i++) {
-      if (prebuild[i].target === napiVersion) return true
-    }
-  }
-  return false
-}
-
-/**
- * Returns the best N-API version to build given the highest N-API
- * version supported by the current Node instance and the N-API versions
- * supported by the package, or undefined if a suitable N-API version
- * cannot be determined.
- *
- * The best build version is the greatest N-API version supported by
- * the package that is less than or equal to the highest N-API version
- * supported by the current Node instance.
- *
- * @returns {number|undefined}
- */
-exports.getBestNapiBuildVersion = function () {
-  var bestNapiBuildVersion = 0
-  var napiBuildVersions = exports.getNapiBuildVersions(pkg) // array of integer strings
-  if (napiBuildVersions) {
-    var ourNapiVersion = exports.getNapiVersion()
-    napiBuildVersions.forEach(function (napiBuildVersionStr) {
-      var napiBuildVersion = parseInt(napiBuildVersionStr, 10)
-      if (napiBuildVersion > bestNapiBuildVersion &&
-        napiBuildVersion <= ourNapiVersion) {
-        bestNapiBuildVersion = napiBuildVersion
-      }
-    })
-  }
-  return bestNapiBuildVersion === 0 ? undefined : bestNapiBuildVersion
-}
-
-/**
- * Returns an array of N-API versions supported by the package.
- *
- * @returns {Array<string>|undefined}
- */
-exports.getNapiBuildVersions = function () {
-  var napiBuildVersions = []
-  // remove duplicates, convert to text
-  if (pkg.binary && pkg.binary.napi_versions) {
-    pkg.binary.napi_versions.forEach(function (napiVersion) {
-      var duplicated = napiBuildVersions.indexOf('' + napiVersion) !== -1
-      if (!duplicated) {
-        napiBuildVersions.push('' + napiVersion)
-      }
-    })
-  }
-  return napiBuildVersions.length ? napiBuildVersions : undefined
-}
-
-/**
- * Returns the highest N-API version supported by the current node instance
- * or undefined if N-API is not supported.
- *
- * @returns {string|undefined}
- */
-exports.getNapiVersion = function () {
-  var version = process.versions.napi // integer string, can be undefined
-  if (!version) { // this code should never need to be updated
-    if (versionArray[0] === 9 && versionArray[1] >= 3) version = '2' // 9.3.0+
-    else if (versionArray[0] === 8) version = '1' // 8.0.0+
-  }
-  return version
-}