Remove pypy (2) testcase.

    ## Tor master doesn't work on Travis Xenial, because it only has

    ## OpenSSL 1.1.0

    ## Pypy 2

    ## End of Life: "forever"

    ## http://doc.pypy.org/en/latest/faq.html#how-long-will-pypy-support-python2

    ## But chutney can decide not to support python 2 after 1 Jan 2020.

    - python: "pypy"

      dist: xenial

      addons:

        apt:

          sources:

            - sourceline: 'deb https://deb.torproject.org/torproject.org tor-nightly-0.4.2.x-xenial main'

              key_url: 'https://deb.torproject.org/torproject.org/A3C4F0F979CAA22CDBA8F512EE8CBC9E886DDD89.asc'

          packages:

            - shellcheck

            - tor

      env: TOR="0.4.2-nightly" NETWORK_FLAVOUR="basic-min"

    ## PyPy does not have documented end of life dates

    - python: "pypy3"

      dist: xenial