ci: remove now-unneeded virtualenv workaround
MODIFY
_travis/run.sh
_travis/run.sh
set -exo pipefail
-# Work around https://github.com/pypa/virtualenv/issues/1561
-if [[ "$(uname -s)" == "Darwin" && "$NOX_SESSION" == "test-2.7" ]]; then
- export PATH="/Library/Frameworks/Python.framework/Versions/2.7/bin":$PATH
-fi
-
if [ -n "${NOX_SESSION}" ]; then
if [[ "$(uname -s)" == 'Darwin' ]]; then
# Explicitly use python3 on macOS as `nox` is not in the PATH

ci: remove now-unneeded virtualenv workaround (#1813)