Add "release" branch type prefix

GH-3

README.md

@@ -105,9 +105,12 @@ Example: `feature/gh-17-tokenizer-api`
 * `test`
 * `task`
 * `subtask`
+* `release`
 
 Every branch must contain *issue ID* which is important to automatically fire some hooks to track the commit in the related GitHub repository issues and pull requests and is **required to contribute to a project**.
 
+A `release` branch is used to prepare a new [tagged](#tags) release version.
+
 ---
 
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