Remove openssl 1.1.1d pin for Travis
OpenSSL 1.1.1f has been released with a fix for the bug introduced in
1.1.1e.  Pinning to 1.1.1d is no longer necessary.
@@ -79,9 +79,6 @@ if [[ $CRICK == true ]]; then
python -m pip install -q git+https://github.com/jcrist/crick.git
fi;
-# Pin openssl==1.1.1d (see https://github.com/dask/distributed/issues/3588)
-conda install -c conda-forge openssl==1.1.1d
-
# Install distributed
python -m pip install --no-deps -e .
