Added versioning API Calls (#109)
Added versioning API Calls (#109)

* Added versioning to Headers before submitting calls

* Fixed the header for delete commands

* Differentiate between data type for password
reference: https://github.com/ig-python/ig-markets-api-python-library/issues/108#issuecomment-619519234
femtotrader/ig-markets-stream-api-python-library,ig-python/ig-markets-api-python-library