Add type statistics generation
Categorize 'tuple' as imprecise
Categorize complex types
Update __exit__ return types to bool

Fix #267.
Make IO objects iterable

Close #268.
Add typing.Traceback

Close #269.
subprocess: Add type annotations
tempfile: Add type annotations
shutil: Add type annotations
Remove self arguments from statistics
tempfile: Refactor
tempfile: Make type more precise
shutil: Update type annotations
random: Make types more precise
pprint: Update type annotation
posixpath: Add precise signature
pprint: Fix signature
fnmatch: Make types more precise
base64: Clean up import
textwrap: Add annotations