0.9.0

What's new with cargo-release 0.9:

• New pre-release-hook allows you to run a hook before release process. If the hook returns a non-zero code, the release process is aborted.
• Tags now pushed in a standalone git push, which is compatible with services like AppVeyol #43
• Skipping publish if configured #39
• Added {{date}} support for pre-release-replacements
• Fixed issue when using cargo-release on Windows #48
• Fixed issue with colors #41