upgrade memote to be pytest 4.x compatible

[Midnighter]

• [x] fix #578, fix #557
• [x] Internal changes
• [x] tests added/passed
• [x] add an entry to the next release

[codecov[bot]]

Codecov Report

Merging #581 into develop will increase coverage by 1.67%. The diff coverage is 84.61%.

@@             Coverage Diff             @@
##           develop     #581      +/-   ##
===========================================
+ Coverage    78.61%   80.29%   +1.67%     
===========================================
  Files           57       57              
  Lines         2960     2953       -7     
  Branches       386      391       +5     
===========================================
+ Hits          2327     2371      +44     
+ Misses         569      516      -53     
- Partials        64       66       +2

Impacted Files	Coverage Δ
memote/suite/tests/test_growth.py	50% <100%> (-5.56%)	:arrow_down:
memote/suite/tests/test_biomass.py	94.5% <100%> (+58.63%)	:arrow_up:
memote/suite/tests/test_essentiality.py	50% <100%> (-5.56%)	:arrow_down:
memote/suite/collect.py	77.14% <71.42%> (-2.03%)	:arrow_down:
memote/suite/tests/test_thermodynamics.py	88.88% <0%> (-11.12%)	:arrow_down:

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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 32d7722...b312a2c. Read the comment docs.

[codecov[bot]]

Codecov Report

Merging #581 into develop will increase coverage by 1.66%. The diff coverage is 78.12%.

@@             Coverage Diff             @@
##           develop     #581      +/-   ##
===========================================
+ Coverage    78.61%   80.28%   +1.66%     
===========================================
  Files           57       57              
  Lines         2960     2957       -3     
  Branches       386      391       +5     
===========================================
+ Hits          2327     2374      +47     
+ Misses         569      518      -51     
- Partials        64       65       +1

Impacted Files	Coverage Δ
memote/suite/tests/test_growth.py	50% <100%> (-5.56%)	:arrow_down:
memote/suite/tests/test_essentiality.py	50% <100%> (-5.56%)	:arrow_down:
memote/suite/collect.py	77.14% <71.42%> (-2.03%)	:arrow_down:
memote/suite/tests/test_biomass.py	91.57% <81.25%> (+55.7%)	:arrow_up:

---

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 32d7722...02dec44. Read the comment docs.