Consistent .transform() signature across transformers

[PhilipDeegan]

For: Exposures FollowUps Outcomes

so far

[codecov[bot]]

Codecov Report

Merging #194 into master will decrease coverage by 0.57%. The diff coverage is 87.8%.

@@            Coverage Diff             @@
##           master     #194      +/-   ##
==========================================
- Coverage    92.9%   92.33%   -0.58%     
==========================================
  Files         148      149       +1     
  Lines        1720     1761      +41     
  Branches       48       30      -18     
==========================================
+ Hits         1598     1626      +28     
- Misses        122      135      +13

Impacted Files	Coverage Δ
.../polytechnique/cmap/cnam/etl/events/Molecule.scala	100% <ø> (ø)	:arrow_up:
...echnique/cmap/cnam/etl/events/Classification.scala	100% <ø> (ø)	:arrow_up:
...polytechnique/cmap/cnam/etl/events/Trackloss.scala	100% <ø> (ø)	:arrow_up:
...a/fr/polytechnique/cmap/cnam/etl/events/Drug.scala	100% <ø> (ø)	:arrow_up:
...polytechnique/cmap/cnam/etl/events/Diagnosis.scala	100% <ø> (ø)	:arrow_up:
...servation/ObservationPeriodTransformerConfig.scala	0% <ø> (ø)	:arrow_up:
...olytechnique/cmap/cnam/etl/events/MedicalAct.scala	100% <ø> (ø)	:arrow_up:
...nique/cmap/cnam/study/fall/config/FallConfig.scala	100% <ø> (ø)	:arrow_up:
...p/cnam/etl/extractors/acts/MedicalActsConfig.scala	100% <ø> (ø)	:arrow_up:
.../polytechnique/cmap/cnam/etl/events/Exposure.scala	100% <ø> (ø)	:arrow_up:
... and 32 more

---

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 de4c6f7...7b1dcd1. Read the comment docs.

[ysebiat]

Broken down to smaller pieces.