Add benchmarks for IndExpPrimal, IndSimplex, IndBallL1, bump Julia to 1.6

[lostella]

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[codecov]

Codecov Report

Merging #126 (ce316f0) into master (e1f7a63) will not change coverage.
The diff coverage is n/a.

❗ Current head ce316f0 differs from pull request most recent head a89c0df. Consider uploading reports for the commit a89c0df to get more accurate results

@@           Coverage Diff           @@
##           master     #126   +/-   ##
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  Coverage   87.40%   87.40%           
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  Files          77       77           
  Lines        2406     2406           
=======================================
  Hits         2103     2103           
  Misses        303      303           

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