[coordinates/patches] removed code branch for unreleased mdtraj

[marscher]

Fixes #1253

[codecov]

Codecov Report

Merging #1391 into devel will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##            devel    #1391      +/-   ##
==========================================
+ Coverage   91.53%   91.54%   +<.01%     
==========================================
  Files         225      225              
  Lines       25482    25479       -3     
==========================================
- Hits        23326    23325       -1     
+ Misses       2156     2154       -2

Impacted Files	Coverage Δ
pyemma/coordinates/util/patches.py	87.08% <100%> (-0.19%)	⬇️
pyemma/coordinates/data/util/traj_info_backends.py	92.48% <0%> (+0.93%)	⬆️

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