Changelog for operational-0.2.1.2

Changelog --------- operational - 0.2.1.0 * minor change: eta-reduce `Program` and `ProgramView` type synonyms operational - 0.2.0.3 * moved project repository to github operational - 0.2.0.0 * changed name of view type to `ProgramView` * added instances for mtl classes * new function `liftProgram` to embed `Program` in `ProgramT` * new example TicTacToe.hs * various documentation updates operational - 0.1.0.0 * initial release