fixup (export PYENV_VERSION before 2.7 tests)

Author: etpinard

circle.yml

@@ -49,6 +49,7 @@ test:
     - sudo chmod -R 777 ${PLOTLY_CONFIG_DIR} && python -c "import plotly"
 
     # test core things in the general 2.7 version that circle has
+    - export PYENV_VERSION=python2
     - nosetests -x plotly/tests/test_core --with-coverage --cover-package=plotly
     - mkdir "${CIRCLE_ARTIFACTS}/2.7" || true
     - coverage html -d "${CIRCLE_ARTIFACTS}/2.7" --title=2.7