[Security] Bump bower from 1.3.8 to 1.8.8

Bumps [bower](https://github.com/bower/bower) from 1.3.8 to 1.8.8. **This update includes security fixes.**
- [Release notes](https://github.com/bower/bower/releases)
- [Changelog](https://github.com/bower/bower/blob/master/CHANGELOG.md)
- [Commits](bower/bower@v1.3.8...v1.8.8)

Signed-off-by: dependabot[bot] <support@dependabot.com>

package.json

@@ -105,7 +105,7 @@
     "axios": "0.16.2",
     "babel-polyfill": "6.26.0",
     "bluebird": "^3.5.1",
-    "bower": "1.3.8",
+    "bower": "1.8.8",
     "chroma-js": "1.3.4",
     "classnames": "^2.2.6",
     "coffee-loader": "0.7.3",