Typeguard

- Added :pep:`561` support
- Added support for empty tuples (``Tuple[()]``)
- Added support for ``typing.Literal``
- Make getting the caller frame faster (PR by Nick Sweeting)

- Fixed thread safety issue with the type hints cache (PR by Kelsey Francis)

- Added support for ``typing.IO`` and derivatives
- Fixed return type checking for coroutine functions
- Dropped support for Python 3.4

- Fixed false positive when checking a callable against the plain ``typing.Callable`` on Python 3.7

- Argument type annotations are no longer unioned with the types of their default values, except in
the case of ``None`` as the default value (although PEP 484 still recommends against this)
- Fixed some generic types (``typing.Collection`` among others) producing false negatives on
Python 3.7
- Shortened unnecessarily long tracebacks by raising a new ``TypeError`` based on the old one
- Allowed type checking against arbitrary types by removing the requirement to supply a call memo
to ``check_type()``
- Fixed ``AttributeError`` when running with the pydev debugger extension installed
- Fixed getting type names on ``typing.*`` on Python 3.7 (fix by Dale Jung)

- Fixed compatibility with Python 3.7
- Removed support for Python 3.3
- Added support for ``typing.NewType`` (contributed by reinhrst)