Commits with quotations fail

Example

> FastlaneCore::Interface::FastlaneShellError: [!] Exit status of command 'cd .. && appcenter codepush release-react -d Staging -a username/app--target-binary-version "1.0.0" --description "Revert "Test soft deployment"" --disable-duplicate-release-error' was 3 instead of 0.

This is due to the following auto generated line of code in the Fastfile:

```ruby
release_notes_command = "git log HEAD --pretty=format:\"%s\" -1"
```

Start with the generated Fastfile and inspect how release_notes_command builds the git log command. Reproduce the reported release with a commit message containing quotations, then verify that the generated command handles those quotations and the release no longer exits with status 3.

Written by the indexing model from the issue text.