Remove the lodash.assign dependency (#393)

lodash.assign is deprecated: ``` npm WARN deprecated lodash.assign@4.2.0: This package is deprecated. Use Object.assign. ```

Author: fson

index.js

@@ -1,5 +1,4 @@
 var babylonToEspree = require("./babylon-to-espree");
-var assign = require("lodash.assign");
 var pick = require("lodash.pickby");
 var Module = require("module");
 var path = require("path");
@@ -54,13 +53,13 @@ function monkeypatch() {
  // monkeypatch estraverse
  estraverse = estraverseRelative.require("estraverse");
  estraverses.push(estraverse);
- assign(estraverse.VisitorKeys, t.VISITOR_KEYS);
+ Object.assign(estraverse.VisitorKeys, t.VISITOR_KEYS);
 
  // monkeypatch estraverse-fb (only for eslint < 2.3.0)
  try {
  var estraverseFb = eslintMod.require("estraverse-fb");
  estraverses.push(estraverseFb);
- assign(estraverseFb.VisitorKeys, t.VISITOR_KEYS);
+ Object.assign(estraverseFb.VisitorKeys, t.VISITOR_KEYS);
  } catch (err) {
  // Ignore: ESLint v2.3.0 does not have estraverse-fb
  }
@@ -69,7 +68,7 @@ function monkeypatch() {
  var estraverseOfEslint = eslintMod.require("estraverse");
  if (estraverseOfEslint !== estraverseFb) {
  estraverses.push(estraverseOfEslint);
- assign(estraverseOfEslint.VisitorKeys, t.VISITOR_KEYS);
+ Object.assign(estraverseOfEslint.VisitorKeys, t.VISITOR_KEYS);
  }
 
  estraverses.forEach(function (estraverse) {

package.json

@@ -15,7 +15,6 @@
  "babel-traverse": "^6.0.20",
  "babel-types": "^6.0.19",
  "babylon": "^6.11.2",
- "lodash.assign": "^4.0.0",
  "lodash.pickby": "^4.0.0"
  },
  "scripts": {

test/integration.js

@@ -1,5 +1,4 @@
 var assert = require("assert");
-var assign = require("lodash.assign");
 var eslint = require("eslint");
 var fs = require("fs");
 var path = require("path");
@@ -56,7 +55,7 @@ function strictSuite () {
  var ruleId = "strict";
 
  describe("when set to 'never'", function () {
- var eslintOpts = assign({}, baseEslintOpts, {
+ var eslintOpts = Object.assign({}, baseEslintOpts, {
  rules: {},
  });
  eslintOpts.rules[ruleId] = [errorLevel, "never"];
@@ -81,7 +80,7 @@ function strictSuite () {
  // describe
 
  describe("when set to 'global'", function () {
- var eslintOpts = assign({}, baseEslintOpts, {
+ var eslintOpts = Object.assign({}, baseEslintOpts, {
  rules: {}
  });
  eslintOpts.rules[ruleId] = [errorLevel, "global"];
@@ -145,7 +144,7 @@ function strictSuite () {
  // describe
 
  describe("when set to 'function'", function () {
- var eslintOpts = assign({}, baseEslintOpts, {
+ var eslintOpts = Object.assign({}, baseEslintOpts, {
  rules: {}
  });
  eslintOpts.rules[ruleId] = [errorLevel, "function"];