Enable CI with Python 3.7

[tovrstra]

No description provided.

[tovrstra]

Blocked by molmod/molmod#31.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@79e853c). Click here to learn what that means.
The diff coverage is 77.04%.

@@            Coverage Diff            @@
##             master      #19   +/-   ##
=========================================
  Coverage          ?   83.15%           
=========================================
  Files             ?       33           
  Lines             ?     5302           
  Branches          ?      943           
=========================================
  Hits              ?     4409           
  Misses            ?      614           
  Partials          ?      279

Impacted Files	Coverage Δ
tamkin/test/test_pftools.py	100% <100%> (ø)
tamkin/test/test_nma.py	100% <100%> (ø)
tamkin/test/test_tunneling.py	100% <100%> (ø)
tamkin/io/cp2k.py	86.15% <100%> (ø)
tamkin/io/trajectory.py	77.65% <100%> (ø)
tamkin/test/test_rotor.py	95.91% <100%> (ø)
tamkin/test/test_partf.py	100% <100%> (ø)
tamkin/rotor.py	90.31% <100%> (ø)
tamkin/test/test_io.py	100% <100%> (ø)
tamkin/test/test_data.py	99.36% <100%> (ø)
... and 21 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 79e853c...ab40687. Read the comment docs.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@79e853c). Click here to learn what that means.
The diff coverage is 77.04%.

@@            Coverage Diff            @@
##             master      #19   +/-   ##
=========================================
  Coverage          ?   83.15%           
=========================================
  Files             ?       33           
  Lines             ?     5302           
  Branches          ?      943           
=========================================
  Hits              ?     4409           
  Misses            ?      614           
  Partials          ?      279

Impacted Files	Coverage Δ
tamkin/test/test_pftools.py	100% <100%> (ø)
tamkin/test/test_nma.py	100% <100%> (ø)
tamkin/test/test_tunneling.py	100% <100%> (ø)
tamkin/io/cp2k.py	86.15% <100%> (ø)
tamkin/io/trajectory.py	77.65% <100%> (ø)
tamkin/test/test_rotor.py	95.91% <100%> (ø)
tamkin/test/test_partf.py	100% <100%> (ø)
tamkin/rotor.py	90.31% <100%> (ø)
tamkin/test/test_io.py	100% <100%> (ø)
tamkin/test/test_data.py	99.36% <100%> (ø)
... and 21 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 79e853c...ab40687. Read the comment docs.