chore: Replace Travis CI with GitHub actions, coveralls with codecov

* semantic-release-cli stopped working with GitHub because GitHub stopped
  supporting Basic Authentication
* coveralls will stop working if I do not log in on the website for a couple of months

.github/workflows/release.yml

@@ -0,0 +1,23 @@
+name: Release
+
+on:
+  push:
+    tags:
+    - 'v[0-9]+.*'
+
+jobs:
+  release:
+    name: Release
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: '14'
+      - run: curl -L https://unpkg.com/@pnpm/self-installer | node
+      - run: |
+          pnpm i --frozen-lockfile --no-verify-store-integrity
+          pnpx semantic-release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}

.github/workflows/test.yml

@@ -0,0 +1,29 @@
+name: Test
+
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    types:
+    - opened
+    - reopened
+    - synchronize
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node: [ '12', '14' ]
+    name: Node.js ${{ matrix.node }}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node }}
+      - run: curl -L https://unpkg.com/@pnpm/self-installer | node
+      - run: |
+          pnpm i --frozen-lockfile --no-verify-store-integrity
+          pnpm run cover
+          pnpx codecov --disable=gcov