bearriver-0.13.4: CHANGELOG

2022-04-21 Ivan Perez <ivan.perez@keera.co.uk>
        * bearriver.cabal: Version bump (0.13.4) (#280), declare changelog file
          (#273), declare subdir of source-repository (#272).
        * CHANGELOG: Add CHANGELOG file (#273).
        * src/: Hide conflicting function in import (#275), fix error in
          reactimate (#266), fix error in implementation of afterEachCat
          (#243), syntax rules (#277).