added stretch (#373)

.circleci/config.yml

@@ -5,7 +5,7 @@ jobs:
     working_directory: ~/circleci-edx-platform
     docker:
       # CircleCI Python images available at: https://hub.docker.com/r/circleci/python/
-      - image: circleci/python:3.5.4
+      - image: circleci/python:3.5.5-stretch
         environment:
           BASH_ENV: ~/.bashrc
     steps: # steps that comprise the `build` job
@@ -19,7 +19,7 @@ jobs:
           name: "Install apt-get packages"
           command: |
             sudo apt-get update
-            sudo apt-get install -y python-software-properties mongodb curl git python-dev libxml2-dev libxmlsec1-dev libgeos-dev
+            sudo apt-get install -y software-properties-common mongodb curl git python-dev libxml2-dev libxmlsec1-dev libgeos-dev
       - run:
           name: "Install python requirements"
           command: |

requirements/edx/testing.txt

@@ -304,7 +304,7 @@ wrapt==1.11.2             # via -c requirements/edx/../constraints.txt, -r requi
 git+https://github.com/edx-solutions/[email protected]#egg=xblock-drag-and-drop-v2==2.2.10  # via -r requirements/edx/base.txt
 xblock-utils==2.1.1       # via -r requirements/edx/base.txt, edx-sga, lti-consumer-xblock, staff-graded-xblock, xblock-drag-and-drop-v2, xblock-google-drive
 xblock==1.3.1             # via -r requirements/edx/base.txt, acid-xblock, crowdsourcehinter-xblock, done-xblock, edx-completion, edx-sga, edx-user-state-client, edx-when, lti-consumer-xblock, ora2, rate-xblock, staff-graded-xblock, xblock-discussion, xblock-drag-and-drop-v2, xblock-google-drive, xblock-poll, xblock-utils
-xmlsec==1.3.3             # via -r requirements/edx/base.txt, python3-saml
+xmlsec==1.3.8             # via -r requirements/edx/base.txt, python3-saml
 xss-utils==0.1.3          # via -r requirements/edx/base.txt
 zipp==1.0.0               # via -c requirements/edx/../constraints.txt, -r requirements/edx/base.txt, -r requirements/edx/coverage.txt, importlib-metadata, importlib-resources