New Features + Bug Patch

[Labfox]

Things in this PR

• Added support to send video and documents
• updated the dependencies (at least on the linux amd64 build), probably fixes #9
• updated the examples (maybe fixes #8 )
• updated the README table of contents
• added the commented api definition to the class (returning NotImplementedError) and removing the non-applicable ones
• update some go functions to meet the news whatsmeow api

Bug fixes:

• Fixed a bug that would cause a systematic crash on Linux (fixes #10 )
• Fixed a bug that would make the message receiving function in go crash when a text message is received while media_path is enabled

I think I will make another PR adding documentation (#12 )