Bump bower from 1.2.8 to 1.8.8 (#4)

Bumps [bower](https://github.com/bower/bower) from 1.2.8 to 1.8.8.
- [Release notes](https://github.com/bower/bower/releases)
- [Changelog](https://github.com/bower/bower/blob/master/CHANGELOG.md)
- [Commits](bower/bower@v1.2.8...v1.8.8)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Diff for: package.json

@@ -42,7 +42,7 @@
   "dependencies": {
   },
   "devDependencies": {
-    "bower": "~1.2.8",
+    "bower": "~1.8.8",
     "grunt": "~0.4.2",
     "grunt-cli": "~0.1.11",
     "grunt-contrib-jshint": "~0.8.0",