Enforce strict mypy checking

[Hofer-Julian]

No description provided.

[codecov]

Codecov Report

Merging #103 (f09d56b) into develop (106aa3e) will increase coverage by 0.42%.
The diff coverage is 92.10%.

❗ Current head f09d56b differs from pull request most recent head e7108bc. Consider uploading reports for the commit e7108bc to get more accurate results

@@             Coverage Diff             @@
##           develop     #103      +/-   ##
===========================================
+ Coverage    87.47%   87.90%   +0.42%     
===========================================
  Files            7        7              
  Lines          503      529      +26     
===========================================
+ Hits           440      465      +25     
- Misses          63       64       +1     

Impacted Files	Coverage Δ
xmipy/logger.py	86.20% <0.00%> (ø)
xmipy/xmiwrapper.py	87.82% <90.90%> (-0.08%)	⬇️
xmipy/utils.py	100.00% <100.00%> (ø)