remove PR instructions that don't apply anymore

Author: Kelly Selden

README.md

@@ -4,14 +4,3 @@
 [![Build status](https://ci.appveyor.com/api/projects/status/h4qxyasxo2nsrd10/branch/v3?svg=true)](https://ci.appveyor.com/project/embercli/ember-cli-update-codemods-manifest/branch/v3)
 
 Master list of codemods and their instructions used by [ember-cli-update](https://github.com/ember-cli/ember-cli-update)
-
-Tips for changing this list:
-
-1. Make the desired change to the manifest.json here.
-1. Fork [ember-cli-update](https://github.com/ember-cli/ember-cli-update).
-1. Do a code search for the URL containing "ember-cli-update-codemods-manifest".
-1. Change it to link to your changes from step 1.
-    * This will look like "https://raw.githubusercontent.com/ember-cli/ember-cli-update-codemods-manifest/vX/manifest.json" => "https://raw.githubusercontent.com/your-username/ember-cli-update-codemods-manifest/your-branch/manifest.json".
-1. Submit the change from step 4 as a pull request to [ember-cli-update](https://github.com/ember-cli/ember-cli-update). The purpose is to run the test suite.
-1. Fix any test failures resulting from step 5.
-1. If your change from step 1 is a new codemod instead of an update or fix to an existing, try and add a new test case to [test/fixtures/codemod](https://github.com/ember-cli/ember-cli-update/tree/master/test/fixtures/codemod). Otherwise, this step is not necessary.