v2.4.0 release changes

[mliu49]

Updated PDF documentation and incremented version numbers.

[codecov]

Codecov Report

Merging #1628 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1628      +/-   ##
==========================================
+ Coverage   41.47%   41.52%   +0.04%     
==========================================
  Files         176      176              
  Lines       29314    29314              
  Branches     6035     6035              
==========================================
+ Hits        12158    12172      +14     
+ Misses      16303    16289      -14     
  Partials      853      853

Impacted Files	Coverage Δ
rmgpy/version.py	100% <100%> (ø)	⬆️
rmgpy/data/kinetics/family.py	52.9% <0%> (+0.23%)	⬆️
rmgpy/scoop_framework/framework.py	32.46% <0%> (+5.19%)	⬆️
rmgpy/scoop_framework/util.py	77.58% <0%> (+8.62%)	⬆️

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