The use of done_testing implies a dependency of Test::More 0.88 or
later. To avoid this, and provide compatibility with older versions,
remove done_testing and supply a test plan.

To ensure that the end of the test is reached (rather than exiting
early due to an error), I added an additional "pass" test to bump
the test count.
Merge pull request #10 from pghmcfc/old-test-more

Avoid dependency on Test::More 0.88