Added package-lock to gitignore

Author: mbj36

.gitignore

@@ -29,3 +29,4 @@ node_modules
 .sass-cache
 build
 lib
+package-lock.json

package.json

@@ -4,8 +4,7 @@
   "description": "React component for syntax highlighting",
   "main": "index.js",
   "scripts": {
-    "prepublish":
-      "babel ./src --out-dir ./lib --plugins=transform-class-properties,transform-react-jsx --presets=env",
+    "prepublish": "babel ./src --out-dir ./lib --plugins=transform-class-properties,transform-react-jsx --presets=env",
     "test": "karma start --single-run",
     "dev-test": "karma start"
   },