Stop testing on Node 9 (jestjs#6591)

* Stop testing on Node 9

* Update config.yml

Author: SimenB

.circleci/config.yml

@@ -73,21 +73,6 @@ jobs:
       - store_test_results:
                 path: reports/junit
 
-  test-node-9:
-    working_directory: ~/jest
-    docker:
-      - image: circleci/node:9
-    steps:
-      - checkout
-      - restore-cache: *restore-cache
-      - run: yarn --no-progress
-      - save-cache: *save-cache
-      - run:
-          command: yarn test-ci-partial
-          environment:
-            JEST_JUNIT_OUTPUT: "reports/junit/js-test-results.xml"
-
-
   test-jest-circus:
     working_directory: ~/jest
     docker:
@@ -156,7 +141,6 @@ workflows:
       - test-node-8
       - test-node-6
       - test-node-10
-      - test-node-9
       - test-jest-circus
       - test-browser
       - test-and-deploy-website