Update release documentation with GitHub generated release notes

Author: catarak

contributor_docs/release.md

@@ -11,21 +11,17 @@ This project release guide is based on
 
 ## Steps
 1. `$ git checkout develop`
-2. `$ git checkout -b release-<newversion>`
-3. Do all of the release branch testing necessary. This could be as simple as running `npm test:ci`, or it could take user testing over a few days. 
-4. `$ npm version <newversion>` (see [npm-version](https://docs.npmjs.com/cli/version) for valid values of <newversion>).
-5. `$ git checkout release`
-6. `$ git merge --no-ff release-<newversion>`
-7. `$ git push && git push --tags`
-8. `$ git checkout develop`
-9.  Create a release on GitHub. Make sure that you release from the `release` branch! You can do this in one of two ways:
-    1.  (Preferred) Use the [`hub` command line tool](https://hub.github.com/). You can automate adding all commit messages since the last release with the following command:
-        ```sh
-        $ hub release create -d -m "<newversion>" -m "$(git log `git describe --tags --abbrev=0 HEAD^`..HEAD --oneline)" <newversion>`
-        ```
-        Note that this creates a draft release, which you can then edit on GitHub. This allows you to create release notes from the list of commit messages, but then edit these notes as you wish.
-    2.  [Draft a new release on Github](https://github.com/processing/p5.js-web-editor/releases/new).
+2. `$ git pull origin develop`
+3. `$ git checkout -b release-<newversion>`
+4. Do all of the release branch testing necessary. This could be as simple as running `npm test:ci`, or it could take user testing over a few days. 
+5. `$ npm version <newversion>` (see [npm-version](https://docs.npmjs.com/cli/version) for valid values of <newversion>).
+6. `$ git checkout release`
+7. `$ git merge --no-ff release-<newversion>`
+8. `$ git push && git push --tags`
+9. `$ git checkout develop`
 10. `$ git merge --no-ff release-<newversion>`
+11. `$ git push origin develop`
+12. [Draft a new release on Github](https://github.com/processing/p5.js-web-editor/releases/new). Choose the tag that is the release version you just created, and then title it `v<newversion>`. Then click "Generate release notes". Publish the release and you are finished!
 
 Travis CI will automatically deploy the release to production, as well as push a production tagged Docker image to DockerHub.