improve config.yml

.circleci/config.yml

@@ -2,7 +2,7 @@ version: 2.1
 jobs:
   build:
     docker:
-      - image: circleci/python:3.7.3
+      - image: circleci/python:3.7.4
     steps:
       - checkout
       - run:
@@ -21,7 +21,7 @@ jobs:
           key: v3-dependencies-{{ checksum "requirements/dev.txt" }}-{{ checksum "requirements/prod.txt" }}
   start_test:
     docker:
-      - image: circleci/python:3.7.3
+      - image: circleci/python:3.7.4
         environment:
           DATABASE_URL: postgresql://myuser:somePwd@localhost:5432/mydb
       - image: circleci/postgres:9.6.5
@@ -69,14 +69,6 @@ jobs:
           paths:
             - ./venv
           key: v3-dependencies-{{ checksum "requirements/dev.txt" }}-{{ checksum "requirements/prod.txt" }}
-  back-deploy-heroku:
-    docker:
-      - image: buildpack-deps:trusty
-    steps:
-      - checkout
-      - run:
-          name: Heroku Deploy
-          command: git push https://heroku:$HEROKU_API_KEY@git.heroku.com/$HEROKU_APP_NAME.git HEAD:master
 workflows:
   version: 2.1
   build_circleci: