Travis: cache Busted and LuaCov as well
Travis: cache Busted and LuaCov as well

tarantool/luarocks,keplerproject/luarocks,keplerproject/luarocks,luarocks/luarocks,luarocks/luarocks,luarocks/luarocks,keplerproject/luarocks,tarantool/luarocks,keplerproject/luarocks,tarantool/luarocks