doc(README.md): clarify that a contributor will merge after LGTMs

Author: Aaron Schlesinger

README.md

@@ -18,9 +18,9 @@ The Deis project welcomes contributions from all developers. The high level proc
 
 - Fork this repository
 - Make your changes
-- Submit a [pull request][prs] (PR) to this repository with your changes, and unit tests whenever possible.
+- Submit a [pull request][prs] (PR) to this repository with your changes, and unit tests whenever possible
 - If your PR fixes any [issues][issues], make sure you write Fixes #1234 in your PR description (where #1234 is the number of the issue you're closing)
-- The Deis core contributors will review your code. After each of them sign off on your code, they'll label your PR with LGTM1 and LGTM2 (respectively). Once that happens, you may merge.
+- The Deis core contributors will review your code. After each of them sign off on your code, they'll label your PR with LGTM1 and LGTM2 (respectively). Once that happens, a contributor will merge it
 
 ## Prerequisites