Remove default failing test
Remove default failing test

By default, a single failing test is included with the gem skeleton.
Since the module won't do much work in this library, it is not likely
that the test file will be touched soon. Therefore, the test has been
removed to make the test suite complete successfully.

jdno/ai_games-four_in_a_row,jdno/ai_games-four_in_a_row