version: 2
jobs:
  build:
    docker:
      - image: circleci/ruby:2.3.7-jessie
    steps:
      - checkout
      - run: make setup
      - run: make test
  build:
    docker:
      - image: circleci/ruby:2.4.4-jessie
    steps:
      - checkout
      - run: make setup
      - run: make test
  build:
    docker:
      - image: circleci/ruby:2.5.1-jessie
    steps:
      - checkout
      - run: make setup
      - run: make test

version: 2
jobs:
  build:
    docker:
      - image: circleci/ruby:2.3.7
    steps:
      - checkout
      - run: make setup
      - run: make test
  build:
    docker:
      - image: circleci/ruby:2.4.4
    steps:
      - checkout
      - run: make setup
      - run: make test
  build:
    docker:
      - image: circleci/ruby:2.5.1
    steps:
      - checkout
      - run: make setup
      - run: make test

Use correct docker images names
Use correct docker images names
