0.1.2 -> 0.2
  - Upgrade to hxt 9.2/9.3.
  - Allow missing data for Maybe fields in records.
  - Add instances for Text in addition to String.
  - More lenient Bool parsing.
  - Better error reporting in Bool parsing.
  - Strip leading and trailing underscores from element names.
  - Only lowercase first character of element names.
  - Add pickler for Either.
  - Fixed recursive schema generation.
  - Move from typLAB to Silk.