chore(package): update gulp-git to version 2.6.0

Author: greenkeeper[bot]

package.json

@@ -66,7 +66,7 @@
     "gulp-conventional-changelog": "1.1.24",
     "gulp-coveralls": "0.1.4",
     "gulp-file": "0.4.0",
-    "gulp-git": "2.5.2",
+    "gulp-git": "2.6.0",
     "gulp-hub": "0.8.0",
     "gulp-inline-ng2-template": "4.1.0",
     "gulp-tslint": "8.1.1",