message: doc: Delete stale URL in test README
diff: @@ -49,7 +49,3 @@ unit tests. The file naming convention is `<source_filename>_tests.cpp`
  and such files should wrap their tests in a test suite
  called `<source_filename>_tests`. For an example of this pattern,
  examine `uint256_tests.cpp`.
  -
  -For further reading, I found the following website to be helpful in
  -explaining how the boost unit test framework works:
  -[http://www.alittlemadness.com/2009/03/31/c-unit-testing-with-boosttest/](http://archive.is/dRBGf).
  