Update 07_workflows.md

change master to main

Author: lmkeston

responses/07_workflows.md

@@ -6,11 +6,11 @@ Suppose you'd like to contribute to the repository pictured below. Which branch
 
 ![a screenshot of a repository's branches, they are: a protected master branch, a protected release-v1.0 branch. The rest are unprotected: bug-fix, green-colors, config-release-drafter, add-template](https://user-images.githubusercontent.com/16547949/56039935-5d1d5800-5d03-11e9-8a26-29d36cfc7499.png)
 
-- [ ] `master`
+- [ ] `main`
 - [ ] `release-v1.0`
 - [ ] `bug-fix`
 - [ ] `green-colors`
 - [ ] `config-release-drafter`
 
 <hr>
-<h3 align="center">I'll respond when you check one of the boxes above.</h3>
+<h3 align="center">I'll respond when you check one of the boxes above.</h3>