2.0.137 (2.0.x "Gold" Release)

The following changes have been made since Alpha 2, back in June:

• Address #22 by adding clj-kondo.exports (this is just a first pass; the :lint-as mappings will probably be replaced by hooks in the future).
• Fix #19 by supporting regex/patterns dynamically inside =? (as well as the compile-time support already in expect).
• Update build-clj to v0.5.0.
• Switch to build.clj/tools.build for CI/deploy.