Bumps @version and @compiler_version to 0.2.0, raises the statifier
floor to ~> 2.2 (lock: statifier 2.1.1 -> 2.2.0, predicator 9.0.1 ->
9.0.2, nothing else moves), assembles the eleven changelog.d fragments
into the 0.2.0 section and deletes them, and points the README install
snippet at ~> 0.2.

Full mix quality green (826 tests, 94.1%); mix docs clean; mix
hex.build produces statifier_blocks-0.2.0.tar with the expected files
and deps. Tag and publish are the operator's.

Refs: sb-mzr