Remove deprecated JvmDefault annotations

[benjamin-bader]

See:
https://kotlinlang.org/docs/whatsnew15.html#deprecation-of-jvmdefault-and-old-xjvm-default-modes

This one's subtle and might require a major-version bump. TL;DR is that prior to 1.5, Kotlin did some ABI-level things to support calling default methods in Kotlin interfaces from Java. The deprecation involves switching a compiler setting, which will change the nature of the ABI a little bit. The next release won't be a drop-in replacement; calling code will also potentially need recompilation.

That said, Android apps are always recompiled so maybe it's not the breaking change it could be.

[codecov-commenter]

Codecov Report

Merging #481 (04334b6) into master (9747f7d) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #481   +/-   ##
=========================================
  Coverage     58.87%   58.87%           
- Complexity      862      864    +2     
=========================================
  Files            69       69           
  Lines          6451     6451           
  Branches       1005     1004    -1     
=========================================
  Hits           3798     3798           
  Misses         2360     2360           
  Partials        293      293           

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