Changelog for copilot-3.2

2020-12-06 * Update optparse-applicative dependency version for newer base versions. (#61). * Add Ivan Perez as co-maintainer (#51). * Update description in cabal file to match copilot-core (#50). 2019-11-22 Ivan Perez <ivan.perez@nianet.org> * Version bump (3.1). * Update multiple examples (#41). * Update instructions to match new repositry name (#45).