Upgrade gulp-rename from 1.4.0 to 2.0.0 (#24)

Bump [gulp-rename](https://github.com/hparra/gulp-rename) from 1.4.0 to 2.0.0.
Changelog: https://github.com/hparra/gulp-rename/blob/master/CHANGELOG.md

Author: dependabot-preview[bot]

package.json

@@ -30,7 +30,7 @@
     "gulp": "^4.0.1",
     "gulp-concat": "^2.6.1",
     "gulp-header": "^2.0.7",
-    "gulp-rename": "^1.4.0",
+    "gulp-rename": "^2.0.0",
     "gulp-size": "^3.0.0",
     "gulp-uglify": "^3.0.2",
     "js-base64": "^2.5.1"