Coverage 4.2 says it supports PyPy3 2.4. But that corresponds to CPython 3.2 which I gather is no longer supported.
Is the note on PyPy3 2.4 support up to date? If not, I suggest removing it; if yes, it could be added to the test matrix in Travis.
FWIW PyPy3 5.2.0-alpha1 is available, and corresponds to CPython 3.3.