v0.4.0

Get it while it's briny with

pip install cloudpickle

Ch-ch-ch-changes

• Fix functions with empty cells (#91)
• Allow pickling Logger objects (#96)
• Fix crash when pickling dynamic class cycles (#102)
• Support WeakSets and ABCMeta instances (#104)
• Ignore "None" modules added to sys.modules (#107)
• Remove non-standard __transient__ support (#110)
• Catch exception from pickle.whichmodule() (#112)