This patch splits create-gitlab-release task from the gitlab directory

Changes include:
  - moves create-gitlab-release task to the task directory

Issue: #386

Signed-off-by: Puneet Punamiya <ppunamiy@redhat.com>

task/create-gitlab-release/0.1/README.md

@@ -13,7 +13,7 @@ Task can also be used to upload `assets` including `binaries` of the released ve
 ## Install the Task
 
 ```
-kubectl apply -f https://raw.githubusercontent.com/tektoncd/catalog/v1beta1/gitlab/create-gitlab-release/create-gitlab-release.yaml
+kubectl apply -f https://raw.githubusercontent.com/tektoncd/catalog/master/task/create-gitlab-release/0.1/create-gitlab-release.yaml
 ```
 
 ## Parameters
@@ -53,4 +53,4 @@ stringData:
   GITLAB_TOKEN: $(personal-gitlab-token)
 ```
 
-This [example](../gitlab/create-gitlab-release/example/run.yaml) can be referred to create Taskrun for Gitlab release. 
+This [example](../gitlab/create-gitlab-release/example/run.yaml) can be referred to create Taskrun for Gitlab release.