Add a Tekton version info to the git-clone README

The version of the `git-clone` task on the master branch of the catalog is only compatible with 0.11-rc1 and above because I modified it to start using Task Results. We've got stuff in the works related to versioning of the catalog but at the very least this version info should be documented. This PR adds version information to the README so that at least we have this documented somewhere.
tektoncd · Mar 19, 2020 · cb0b901 · cb0b901
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commit cb0b901
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diff --git a/git/README.md b/git/README.md
@@ -5,6 +5,8 @@ in your Pipeline.
 
 ## `git-clone`
 
+**Please Note: this Task is only compatible with Tekton Pipelines versions 0.11-rc1 and greater!**
+
 This `Task` has two required inputs:
 
 1. The URL of a git repo to clone provided with the `url` param.