message: Fix google death test URL
  Old URL resulted in 404
diff: @@ -95,7 +95,7 @@ Planned features for future releases - order changes constantly... Also look thr
  - support for LibIdentify
  - add CHECKED_IF & friends: https://github.com/catchorg/Catch2/issues/1278
  - support for running tests in parallel in multiple threads
  -- death tests - as in [google test](https://github.com/google/googletest/blob/master/googletest/docs/advanced.md#death-tests)
  +- death tests - as in [google test](https://github.com/google/googletest/blob/master/docs/advanced.md#death-tests)
  - config options
  - test case name uniqueness - reject the ones with identical names
  - command line options
  