Get rid of scalaj-collections

[wsuchy]

There is no Scala 2.12 version of that library.

[codecov[bot]]

Codecov Report

Merging #333 into master will decrease coverage by 0.04%. The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #333      +/-   ##
==========================================
- Coverage   86.58%   86.54%   -0.05%     
==========================================
  Files         335      335              
  Lines       10748    10751       +3     
  Branches      359      354       -5     
==========================================
- Hits         9306     9304       -2     
- Misses       1442     1447       +5

Impacted Files	Coverage Δ
...ala/com/salesforce/op/features/types/package.scala	51.06% <0%> (-1.12%)	:arrow_down:
...es/src/main/scala/com/salesforce/op/OpParams.scala	85.71% <0%> (-4.09%)	:arrow_down:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 13ddb4f...5ab37ef. Read the comment docs.

[salesforce-cla[bot]]

Thanks for the contribution! Before we can merge this, we need @wsuchy to sign the Salesforce.com Contributor License Agreement.