Support Erlang/OTP 27.x (#320)

* Test also using Erlang/OTP 27.0 and 27.3 on the CI

* Add parsetools to dialyzer PLT apps

Some cleanups in the parallel code (#275)

Up the version to 1.3.0

Merge pull request #125 from jaynel/patch-1

Bump proper.app.src to 1.2 to match the new tag

Bump version to 1.1

PropEr version 1.0 release