Deleting message on PR that would discourage making a PR as we could not accept them in the past. (#6)

Now that we can take PRs it doesn't make sense to discourage folks from making them.
diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
deleted file mode 100644
index e699df7..0000000
--- a/.github/pull_request_template.md
+++ /dev/null
@@ -1,7 +0,0 @@
-Dear potential contributor,
-
-Our project is not set up to take Pull Requests through GitHub. Instead we ask that contributions be made through Apache's ReviewBoard. Further instructions can be found here: https://aurora.apache.org/documentation/latest/contributing/
-
-Thank you for your understanding.
-
-- The Apache Aurora Team