Update "master" references to "main"

This is becoming the standard branch name now, and the integration tests
no longer work on my machine without this change.

Author: m1foley

Diff for: README.md

@@ -74,10 +74,10 @@ The `Enabled` property accepts multiple formats:
 # true/false to enable/disable the validation (branch agnostic)
 Validators/Foo:
   Enabled: false
-# Array of String/Regex matching each branch for which it's enabled
+# Array of String or Regex matching each branch it's enabled on
 Validators/Bar:
   Enabled:
-    - master
+    - main
     - !ruby/regexp /\Afoo.+bar/
 ```
 

Diff for: test/integration/new_repo_test.rb

@@ -33,7 +33,7 @@ def shell_commands(gitdir)
       assert_match(/^#{commit_message}/, results)
       assert_match(/^1: Error: /, results)
       refute_match(/Warning:/, results)
-      refute_match(/^\[master .+\]/, results)
+      refute_match(/^\[main .+\]/, results)
     end
   end
 
@@ -44,7 +44,7 @@ def shell_commands(gitdir)
       refute_match(/^#{commit_message}/, results)
       refute_match(/Error:/, results)
       refute_match(/Warning:/, results)
-      assert_match(/^\[master .+\] #{commit_message}/, results)
+      assert_match(/^\[main .+\] #{commit_message}/, results)
     end
   end
 
@@ -55,7 +55,7 @@ def shell_commands(gitdir)
       refute_match(/^#{commit_message}/, results)
       refute_match(/Error/, results)
       assert_match(/^1: Warning: /, results)
-      assert_match(/^\[master .+\] #{commit_message}/, results)
+      assert_match(/^\[main .+\] #{commit_message}/, results)
     end
   end
 end