Merge pull request #74 from nicoddemus/update-dev-version

Update version to 0.5.2.dev

Author: nicoddemus

pluggy/__init__.py

@@ -2,7 +2,7 @@
 import warnings
 from .callers import _MultiCall, HookCallError, _raise_wrapfail, _Result
 
-__version__ = '0.5.1'
+__version__ = '0.5.2.dev'
 
 __all__ = ["PluginManager", "PluginValidationError", "HookCallError",
            "HookspecMarker", "HookimplMarker"]