Use the package name tripper (not tripperpy)

[CasperWA]

Closes #13

The tripper package name has been released and claimed by us.
This PR updates the package name accordingly, so that the package can now be installed via pip install tripper.

Note: The previous package name (tripperpy) will become a proxy package for tripper.

[codecov-commenter]

Codecov Report

Base: 69.35% // Head: 69.35% // No change to project coverage 👍

Coverage data is based on head (eb4a7bf) compared to base (8ef8b4e).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #16   +/-   ##
=======================================
  Coverage   69.35%   69.35%           
=======================================
  Files           6        6           
  Lines         509      509           
=======================================
  Hits          353      353           
  Misses        156      156           

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