Update ESLint (and eslint-plugin-mozilla) to the latest version

.eslintrc

@@ -59,7 +59,9 @@
     "no-implied-eval": "error",
     "no-iterator": "error",
     "no-lone-blocks": "error",
-    "no-multi-spaces": "error",
+    "no-multi-spaces": ["error", {
+      "ignoreEOLComments": true,
+    }],
     "no-multi-str": "error",
     "no-new-func": "error",
     "no-new-wrappers": "error",

package.json

@@ -8,8 +8,8 @@
     "babel-plugin-transform-es2015-modules-commonjs": "^6.23.0",
     "babel-preset-es2015": "^6.24.1",
     "escodegen": "^1.8.0",
-    "eslint": "^3.19.0",
+    "eslint": "^4.2.0",
-    "eslint-plugin-mozilla": "^0.2.47",
+    "eslint-plugin-mozilla": "^0.4.0",
     "gulp": "^3.9.1",
     "gulp-rename": "^1.2.2",
     "gulp-replace": "^0.5.4",

src/display/api.js

@@ -1293,7 +1293,7 @@ var PDFWorker = (function PDFWorkerClosure() {
     this._initialize();
   }
 
-  PDFWorker.prototype =  /** @lends PDFWorker.prototype */ {
+  PDFWorker.prototype = /** @lends PDFWorker.prototype */ {
     get promise() {
       return this._readyCapability.promise;
     },