Breaking interface changes in `WavInfoReader`

[iluvcapra]

It makes more sense this way but it breaks everything prior to this version. The path variable in the WavInfoReader initializer is renamed f, conveying the idea that it does not have to be a path but can be an f, a file path or a stream.

[codecov[bot]]

Codecov Report

Merging #28 (41b84b8) into master (c25ac56) will not change coverage. Report is 3 commits behind head on master. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #28   +/-   ##
=======================================
  Coverage   95.62%   95.62%           
=======================================
  Files          22       22           
  Lines        1280     1280           
=======================================
  Hits         1224     1224           
  Misses         56       56           

Files	Coverage Δ
wavinfo/__main__.py	75.00% <100.00%> (ø)
wavinfo/wave_reader.py	100.00% <100.00%> (ø)

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