Support for multiple types validation in type + typing support

[smarie]

No description provided.

[smarie]

Several things need to be handled:

• If we use a tuple in type_hint the TypeError does not properly formats: AttributeError: 'tuple' object has no attribute '__name__'

• if we use a typing.Union, does it work ?

• doc needs to be updated accordingly

[smarie]

The following type checkers exist:

• typeguard: python 3.5+, seems compliant with python 3.7
• pytypes: python 2+, still has issues covering python 3.7, maybe slower but more capable than typeguard (to be documented with a recent benchmark)
• enforce for 3.5+, no commit since June 2017
• typo, no commits since November 2016
• ...

Some benchmarks were made by attrs but this is quite old already: python-attrs/attrs#301

In addition, typing_inspect provides an API for the typing module that is supposed to cover most version. A version compliant with python 3.5.3- is available in valid8 already.