Increase version to 3.7.1

Author: rmk135

docs/main/changelog.rst

@@ -7,6 +7,10 @@ that were made in every particular version.
 From version 0.7.6 *Dependency Injector* framework strictly 
 follows `Semantic versioning`_
 
+3.7.1
+-----
+- Add support of six 1.11.0.
+
 3.7.0
 -----
 - Add ``FactoryAggregate`` provider.

src/dependency_injector/__init__.py

@@ -1,6 +1,6 @@
 """Dependency injector top-level package."""
 
-__version__ = '3.7.0'
+__version__ = '3.7.1'
 """Version number that follows semantic versioning.
 
 :type: str