chore(package): update dependencies and add lockfile

Author: vanwagonet

package-lock.json

@@ -25,17 +25,17 @@
   },
   "homepage": "https://github.com/thetalecrafter/img-loader",
   "dependencies": {
-    "imagemin": "^5.2.0",
-    "imagemin-gifsicle": "^5.1.0",
+    "imagemin": "^5.3.1",
+    "imagemin-gifsicle": "^5.2.0",
     "imagemin-mozjpeg": "^7.0.0",
     "imagemin-optipng": "^5.2.0",
-    "imagemin-pngquant": "^5.0.0",
+    "imagemin-pngquant": "^5.0.1",
     "imagemin-svgo": "^6.0.0",
-    "loader-utils": "^1.0.4"
+    "loader-utils": "^1.1.0"
   },
   "devDependencies": {
     "mocha": "^5.0.0",
-    "safe-buffer": "^5.0.1",
+    "safe-buffer": "^5.1.1",
     "standard": "^10.0.1"
   },
   "scripts": {