ci: migrate from travis to github actions

Author: nodkz

.github/FUNDING.yml

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+# These are supported funding model platforms
+
+github: [nodkz]
+patreon: # Replace with a single Patreon username
+open_collective: graphql-compose
+ko_fi: # Replace with a single Ko-fi username
+tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: # Replace with a single IssueHunt username
+otechie: # Replace with a single Otechie username
+custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']

.github/workflows/nodejs.yml

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+# This workflow will do a clean install of node dependencies, build the source code and run tests across different versions of node
+# For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions
+
+name: Node.js CI
+
+on: [push, pull_request]
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [12.x]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: Install node_modules
+        run: yarn
+      - name: Test & lint
+        run: yarn test
+        env:
+          CI: true
+      - name: Send codecov.io stats
+        if: matrix.node-version == '12.x'
+        run: bash <(curl -s https://codecov.io/bash) || echo ''
+