fix: Changed the name of "tsStat" function to txstat and endpoint.
fix: Changed the name of "tsStat" function to txstat and endpoint.

The endpoint of the tsSat function was changed from 'tsStat' to 'txstat'. Also, following
the function naming convention obvserved, the function name was changed to 'txstat'.

Resolves: #1

binary-signal/shapeshift.io-python-api