fix: upgrade dependencies. add standard-version for release management (

#10)

index.js

@@ -1,7 +1,7 @@
 'use strict'
 
 var assign = require('lodash.assign')
-var async = require('async')
+var eachLimit = require('async').eachLimit
 var spawn = require('cross-spawn')
 
 module.exports = function (packages, _options, cb) {
@@ -16,8 +16,8 @@ module.exports = function (packages, _options, cb) {
     stdio: 'inherit'
   }, _options)
 
-  async.eachLimit(packages, 1, function (arg, next) {
-    var pkg = arg.split('@')[0]
+  eachLimit(packages, 1, function (arg, next) {
+    var pkg = arg.substr(0, arg.indexOf('@')) || arg
     try {
       // TODO: Either skip this part if a version has been provided or check the package json version
       require.resolve(pkg)

package.json

@@ -7,7 +7,8 @@
   "scripts": {
     "pretest": "standard",
     "test": "nyc ./node_modules/.bin/_mocha --timeout=30000",
-    "coverage": "nyc report --reporter=text-lcov | coveralls"
+    "coverage": "nyc report --reporter=text-lcov | coveralls",
+    "release": "standard-version"
   },
   "repository": {
     "type": "git",
@@ -26,17 +27,18 @@
   },
   "homepage": "https://github.com/bcoe/optional-dev-dependency#readme",
   "dependencies": {
-    "async": "^1.4.2",
+    "async": "^2.0.0-rc.6",
     "cross-spawn": "^4.0.0",
-    "lodash.assign": "^3.2.0",
-    "yargs": "^3.24.0"
+    "lodash.assign": "^4.0.9",
+    "yargs": "^4.7.1"
   },
   "devDependencies": {
     "chai": "^3.2.0",
     "coveralls": "^2.11.4",
     "mocha": "^2.3.2",
-    "nyc": "^3.2.2",
+    "nyc": "^7.0.0-alpha.5",
     "rimraf": "^2.4.3",
-    "standard": "^5.2.2"
+    "standard": "^7.1.2",
+    "standard-version": "^2.3.1"
   }
 }