Bump version to 4.0.6

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`_
 
+4.0.6
+-----
+- Fix wiring for top-level package ``__init__.py``.
+
 4.0.5
 -----
 - Move ``.provided`` attribute to ``providers.Provider``.

src/dependency_injector/__init__.py

@@ -1,6 +1,6 @@
 """Top-level package."""
 
-__version__ = '4.0.5'
+__version__ = '4.0.6'
 """Version number.
 
 :type: str