Update rollup to 0.67.3

Author: Brendan Mullins

lib/purgecss-webpack-plugin.es.js

@@ -1,7 +1,7 @@
-import path from 'path';
 import fs from 'fs';
 import Purgecss from 'purgecss';
 import { ConcatSource } from 'webpack-sources';
+import path from 'path';
 
 function _classCallCheck(instance, Constructor) {
   if (!(instance instanceof Constructor)) {

lib/purgecss-webpack-plugin.js

@@ -2,10 +2,10 @@
 
 function _interopDefault (ex) { return (ex && (typeof ex === 'object') && 'default' in ex) ? ex['default'] : ex; }
 
-var path = _interopDefault(require('path'));
 var fs = _interopDefault(require('fs'));
 var Purgecss = _interopDefault(require('purgecss'));
 var webpackSources = require('webpack-sources');
+var path = _interopDefault(require('path'));
 
 function _classCallCheck(instance, Constructor) {
   if (!(instance instanceof Constructor)) {

package.json

@@ -39,30 +39,30 @@
   },
   "homepage": "https://github.com/FullHuman/purgecss-webpack-plugin#readme",
   "devDependencies": {
-    "@babel/core": "^7.0.0",
+    "@babel/core": "^7.1.6",
     "@babel/plugin-proposal-object-rest-spread": "^7.0.0",
     "@babel/plugin-syntax-object-rest-spread": "^7.0.0",
-    "@babel/preset-env": "^7.0.0",
+    "@babel/preset-env": "^7.1.6",
     "babel-core": "^7.0.0-bridge.0",
-    "babel-eslint": "^10.0.0",
-    "babel-jest": "^23.4.2",
-    "codacy-coverage": "^3.0.0",
-    "css-loader": "^1.0.0",
-    "eslint": "^5.4.0",
-    "jest": "^23.5.0",
-    "mini-css-extract-plugin": "^0.4.0",
-    "prettier": "^1.14.0",
-    "rollup": "^0.66.0",
-    "rollup-plugin-babel": "^4.0.1",
-    "rollup-plugin-commonjs": "^9.1.3",
-    "rollup-plugin-node-resolve": "^3.3.0",
+    "babel-eslint": "^10.0.1",
+    "babel-jest": "^23.6.0",
+    "codacy-coverage": "^3.2.0",
+    "css-loader": "^1.0.1",
+    "eslint": "^5.9.0",
+    "jest": "^23.6.0",
+    "mini-css-extract-plugin": "^0.4.4",
+    "prettier": "^1.15.2",
+    "rollup": "^0.67.3",
+    "rollup-plugin-babel": "^4.0.3",
+    "rollup-plugin-commonjs": "^9.2.0",
+    "rollup-plugin-node-resolve": "^3.4.0",
     "rollup-watch": "^4.3.1",
     "webpack": "^4 || ^3",
     "webpack-cli": "^3"
   },
   "dependencies": {
     "purgecss": "^1.1.0",
-    "webpack-sources": "^1.2.0"
+    "webpack-sources": "^1.3.0"
   },
   "peerDependencies": {
     "webpack": "^4 || ^3"