Update browserslist-ga version

- Bump browserslist-ga version.
- Update usage instructions in README to reflect updated dimensions used
  by new version of browserslist-ga.
- Ignore package-lock.json file.

.gitignore

@@ -1 +1,2 @@
-/node_modules
+/node_modules
+package-lock.json

README.MD

@@ -28,7 +28,7 @@ $ yarn add --dev browserslist-ga-export
       2. Operating System Version
       3. Browser
       4. Browser Version
-      5. Mobile (Including Tablet)
+      5. Device Category
     - **Metrics**: Pageviews or Page Views
 2. View the report.
 3. Sort the report by Browser column ascending alphabetically (arrow in column header facing up).

package.json

@@ -17,14 +17,14 @@
   ],
   "bin": {
     "browserslist-ga-export": "./index.js"
-  },  
+  },
   "keywords": [
     "browserslist",
     "browserslist-ga",
     "browserslist-stats.json"
   ],
   "dependencies": {
-    "browserslist-ga": "0.0.11",
+    "browserslist-ga": "0.0.12",
     "csvtojson": "^1.1.12",
     "yargs": "^11.0.0"
   }