Add Parabolic SAR indicator

[eirik-thorp]

[codecov[bot]]

Codecov Report

Merging #131 (36fe903) into master (1136fe2) will increase coverage by 0.14%. Report is 4 commits behind head on master. The diff coverage is 88.88%.

:exclamation: Current head 36fe903 differs from pull request most recent head 49e5f1f. Consider uploading reports for the commit 49e5f1f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #131      +/-   ##
==========================================
+ Coverage   76.71%   76.86%   +0.14%     
==========================================
  Files         227      228       +1     
  Lines        9071     9107      +36     
==========================================
+ Hits         6959     7000      +41     
+ Misses       2112     2107       -5     

Files	Coverage Δ
qf_lib/common/utils/miscellaneous/parabolic_sar.py	88.88% <88.88%> (ø)

... and 3 files with indirect coverage changes

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