Switch to Optimization.jl

[devmotion]

GalacticOptim was renamed to Optimization.

[codecov]

Codecov Report

Merging #1836 (b259973) into master (f0fc1ea) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1836   +/-   ##
=======================================
  Coverage   81.73%   81.73%           
=======================================
  Files          24       24           
  Lines        1500     1500           
=======================================
  Hits         1226     1226           
  Misses        274      274           

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[coveralls]

Pull Request Test Coverage Report for Build 2457561382

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 81.733%

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Totals
Change from base Build 2421729224:	0.0%
Covered Lines:	1226
Relevant Lines:	1500

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💛 - Coveralls