188 depreciated inplace keyword

[patrickleonardy]

Story Title

depreciated inplace keyword

Changes made

• removed all inplace keywords as the performance increase is minimal and it is generally considered a bad habit

How does the solution address the problem

Some of the inplace keywords have been removed from pandas. So to ensure that similar depreciation errors will not arise in the future all inplace keywords have been removed from the code

Linked issues

Resolves #188