Update module heroku/x to v0.0.14

Author: renovate-bot

go.mod

@@ -7,8 +7,7 @@ require (
 	github.com/gin-contrib/sse v0.1.0 // indirect
 	github.com/gin-gonic/contrib v0.0.0-20190923054218-35076c1b2bea
 	github.com/gin-gonic/gin v1.4.0
-	github.com/golang/protobuf v1.3.2 // indirect
-	github.com/heroku/x v0.0.9
+	github.com/heroku/x v0.0.14
 	github.com/json-iterator/go v1.1.7 // indirect
 	github.com/mattn/go-isatty v0.0.9 // indirect
 	github.com/ugorji/go v1.1.7 // indirect