README.md

Semantic versioning example

bumpversion flow:

1.0.0 => 1.0.1-dev1 => 1.0.1-dev2 = > 1.0.1-rc1 => 1.0.1-rc2 => 1.0.1
         patch         build          release      build        release

Start with an initial release, say 1.0.0.

Create a new release, starting with a development build.
```
 $ bumpversion patch
 => 1.0.1-dev1
```
Every time you build, bump build.
```
 $ bumpversion build
 => 1.0.1-dev2
```
Go to release candidate by bumping release.
```
 $ bumpversion release
 => 1.0.1-rc1
```
With every new build, bump build.
```
 $ bumpversion build
 => 1.0.1-rc2
```
Finally, bump release to generate a final release for the current major / minor / patch version.
```
 $ bumpversion release
 => 1.0.1
```

Once the final release has been reached, it is not possible to bump the release before bumping patch again. Trying to bump the release while in final release state will issue ValueError: The part has already the maximum value among ['dev', 'rc', 'ga'] and cannot be bumped.