[WIP] Refactor build.sbt

[oshikiri]

• [ ] Update monocle to v1.3.2 (c.f. https://github.com/vegas-viz/Vegas/pull/127)
• [ ] ~Update selenium-java~ (cherry-pick https://github.com/vegas-viz/Vegas/pull/151)
• [ ] ~Add CI settings for scala 2.12?~

[codecov-io]

Codecov Report

Merging #154 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #154   +/-   ##
=====================================
  Coverage       0%     0%           
=====================================
  Files          27     27           
  Lines        1783   1783           
  Branches        5      5           
=====================================
  Misses       1783   1783

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[oshikiri]

Resolved by another PR