remove py36 in localmode buildspec ci-script

Author: Chuyang Deng

buildspec-localmodetests.yml

@@ -12,4 +12,4 @@ phases:
       # local mode tests
       - start_time=`date +%s`
       - execute-command-if-has-matching-changes "tox -e py27,py37 -- tests/integ -m local_mode --durations 50" "tests/integ" "tests/data" "tests/conftest.py" "tests/__init__.py" "src/*.py" "setup.py" "setup.cfg" "buildspec-localmodetests.yml"
-      - ./ci-scripts/displaytime.sh 'py27,py36,py37 local mode' $start_time
+      - ./ci-scripts/displaytime.sh 'py27,py37 local mode' $start_time