fix: the release commit subject should not be sentence case

Instead of "chore: Release v1.2.3"
the commit message should be "chore: release v1.2.3"
with a lowercase "release".

Author: jcouball

lib/create_github_release/tasks/commit_release.rb

@@ -31,7 +31,7 @@ class CommitRelease < TaskBase
       #
       def run
         print 'Making release commit...'
-        `git commit -s -m 'chore: Release #{project.next_release_tag}'`
+        `git commit -s -m 'chore: release #{project.next_release_tag}'`
         if $CHILD_STATUS.success?
           puts 'OK'
         else

spec/create_github_release/tasks/commit_release_spec.rb

@@ -28,7 +28,7 @@
 
     let(:mocked_commands) do
       [
-        MockedCommand.new("git commit -s -m 'chore: Release #{next_release_tag}'", exitstatus: git_exitstatus)
+        MockedCommand.new("git commit -s -m 'chore: release #{next_release_tag}'", exitstatus: git_exitstatus)
       ]
     end