Fix docker image

Author: Legendmiha

.circleci/config.yml

@@ -3,7 +3,7 @@ jobs: # a collection of steps
   build: # runs not using Workflows must have a `build` job as entry point
     working_directory: ~/elasticio-rest-node # directory where steps will run
     docker: # run the steps with Docker
-      - image: circleci/node:10.15 # ...with this image as the primary container; this is where all `steps` will run
+      - image: circleci/node:12 # ...with this image as the primary container; this is where all `steps` will run
     steps: # a collection of executable commands
       - checkout # special step to check out source code to working directory
       - run: