Travis workaround script no longer necessary

.travis_py37_workaround.sh

@@ -1,16 +0,0 @@
-echo "The ready-made virtualenv is not the one we want. Deactivating..."
-deactivate
-
-echo "Installing 3.7 from deadsnakes..."
-sudo apt-get --yes install python3.7
-
-echo "Creating a fresh virtualenv. We can't use `ensurepip` because Debian."
-python3.7 -m venv ~/virtualenv/python3.7-deadsnakes --without-pip
-source ~/virtualenv/python3.7-deadsnakes/bin/activate
-
-echo "We ensure our own pip."
-curl -sSL https://bootstrap.pypa.io/get-pip.py | python3.7
-
-echo
-echo "Python version:"
-python3.7 -c "import sys; print(sys.version)"