Removes the Node 8 MacOS test, which isnt supported by CircleCI anymore

Author: arcanis

.circleci/config.yml

@@ -248,10 +248,6 @@ workflows:
           filters: *default_filters
           requires:
             - install
-      - test-macos-node8:
-          filters: *default_filters
-          requires:
-            - install
       - build:
           filters: *default_filters
           requires:
@@ -267,6 +263,5 @@ workflows:
             - test-linux-node6
             - test-linux-node4
             - test-macos-node10
-            - test-macos-node8
             - lint
             - build