Bumping version (#83)

Author: IanWoodard

README.md

@@ -16,7 +16,7 @@ You'll need [jsonnet-bundler](https://github.com/jsonnet-bundler/jsonnet-bundler
 
 ```sh
 jb init
-jb install https://github.com/getsentry/gocd-jsonnet.git/libs@v2.14.0
+jb install https://github.com/getsentry/gocd-jsonnet.git/libs@v2.15.0
 ```
 
 ## Build