Bump to v4

[nolze]

No description provided.

[codecov-io]

Codecov Report

Merging #5 into master will increase coverage by 0.59%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master       #5      +/-   ##
==========================================
+ Coverage   45.78%   46.38%   +0.59%     
==========================================
  Files           8        7       -1     
  Lines         380      373       -7     
==========================================
- Hits          174      173       -1     
+ Misses        206      200       -6

Impacted Files	Coverage Δ
msoffcrypto/__main__.py	0% <0%> (ø)	⬆️
msoffcrypto/__init__.py	70% <70%> (-30%)	⬇️

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