Refactor spec/Spec.scala

[oshikiri]

• convert map/flatMap into a for comprehension (c.f. https://stackoverflow.com/questions/12792595/how-to-convert-this-map-flatmap-into-a-for-comprehension-in-scala)
• and fix indents

[codecov-io]

Codecov Report

Merging #137 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #137    +/-   ##
======================================
  Coverage       0%     0%            
======================================
  Files          27     27            
  Lines        1783   1906   +123     
  Branches        5      5            
======================================
- Misses       1783   1906   +123

Impacted Files	Coverage Δ
core/src/main/scala/vegas/spec/Spec.scala	0% <ø> (ø)	:arrow_up:

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[oshikiri]

@rgbkrk Thanks!