Fix circle ci (again) (#712)

* Fix CircleCI build

Install Python3.7 as the new CircleCI image ships with Python3.6 and the min we need is 3.7

* Don't install pipenv

* Install missing dependencies

* Undo the removed filter which made this job run on every branch. only had this to test.

Author: eak12913

.circleci/config.yml

@@ -28,7 +28,7 @@ references:
       command: |
         sudo add-apt-repository --yes ppa:deadsnakes/ppa
         sudo apt-get update
-        sudo apt-get install python3.7
+        sudo apt-get install python3.7 python3-distutils python3-apt
 
   install_pip: &install-pip
     run: