Make sure the colorizer is reset
Make sure the colorizer is reset

This is done using the colored_reporter destructor.

This should fix the part of #90, i.e., that colors are changed when the
code exits unexpectedly, or in case the reporter simply does not reset
the colorizer.

joakimkarlsson/bandit,ogdf/bandit,joakimkarlsson/bandit,joakimkarlsson/bandit,ogdf/bandit