Upgrade to Gatsby v2

.circleci/config.yml

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+version: 2
+
+defaults: &defaults
+  working_directory: ~/repo
+  docker:
+    - image: circleci/node:8.9.1
+
+jobs:
+  test:
+    <<: *defaults
+    steps:
+      - checkout
+      - restore_cache:
+          keys:
+            - v1-dependencies-{{ checksum "yarn.lock" }}
+            # fallback to using the latest cache if no exact match is found
+            - v1-dependencies-
+
+      - run:
+          name: Install and build package
+          command: yarn install --frozen-lockfile
+
+     - run: 
+          name: "Lint"
+          command: yarn lint:all
+
+      - run:
+          name: Coverage
+          command: yarn test:coverage --runInBand --no-cache
+
+      - run:
+          name: Unit tests
+          command: yarn test --runInBand --no-cache
+
+      - save_cache:
+          paths:
+            - node_modules
+          key: v1-dependencies-{{ checksum "yarn.lock" }}
+workflows:
+  version: 2
+  build_test:
+    jobs:
+      - test