Fixed addedMass typo in setup.py.

[ejtovar]

Mandatory Checklist

Please ensure that the following criteria are met:

• [x ] Title of pull request describes the changes/features
• [x ] Request at least 2 reviewers
• [ ] If new files are being added, the files are no larger than 100kB. Post the file sizes.
• [ ] Code coverage did not decrease. If this is a bug fix, a test should cover that bug fix. If a new feature is added, a test should be made to cover that feature.
• [ ] New features have appropriate documentation strings (readable by sphinx)
• [ ] Contributor has read and agreed with CONTRIBUTING.md and has added themselves to CONTRIBUTORS.md

As a general rule of thumb, try to follow PEP8 guidelines.

Description

[codecov[bot]]

Codecov Report

Merging #1146 into master will increase coverage by 0.13%. The diff coverage is 59.24%.

@@            Coverage Diff             @@
##           master    #1146      +/-   ##
==========================================
+ Coverage   51.63%   51.77%   +0.13%     
==========================================
  Files         539      540       +1     
  Lines      102272   103400    +1128     
==========================================
+ Hits        52805    53531     +726     
- Misses      49467    49869     +402     

Impacted Files	Coverage Δ
proteus/WaveTools.py	0.00% <0.00%> (ø)
proteus/config/copper.py	0.00% <ø> (ø)
proteus/mprans/RANS3PSed.py	0.00% <0.00%> (ø)
proteus/mprans/VOS3P.py	0.00% <0.00%> (ø)
proteus/mprans/Dissipation.py	11.87% <12.50%> (+0.41%)	:arrow_up:
proteus/mprans/Kappa.py	11.73% <12.50%> (+0.27%)	:arrow_up:
...sts/solver_tests_mprans/import_modules/cavity2d.py	66.18% <25.00%> (ø)
proteus/tests/griffiths_lane_6/sm_gl_6_3d_n.py	94.73% <50.00%> (-5.27%)	:arrow_down:
proteus/tests/griffiths_lane_6/sm_gl_6_3d_p.py	71.87% <50.00%> (-0.74%)	:arrow_down:
proteus/tests/TwoPhaseFlow/damBreak_PUMI.py	92.59% <92.59%> (ø)
... and 13 more

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