Use GitHub Actions instead of Travis CI

This change uses GitHub Actions to automate the release process as much
as possible.

.github/workflows/ci.yml

@@ -0,0 +1,29 @@
+name: CI
+
+on:
+  pull_request: {}
+  push:
+    branches:
+      - master
+
+jobs:
+
+  test:
+    name: CI
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v2
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get install -y \
+            fp-compiler-3.0.4
+
+      - name: Compile
+        run: sbt test:compile
+
+      - name: Test
+        run: sbt test

.github/workflows/release.yml

@@ -0,0 +1,50 @@
+name: Release
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+
+  release:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Bump version and push tag
+        id: bump-version
+        uses: anothrNick/github-tag-action@c170e78287f338a4af0dc49e033e50e5a072d82b
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          WITH_V: true
+          DEFAULT_BUMP: patch
+          INITIAL_VERSION: 1.0.0
+
+      - name: Package
+        run: |
+          sbt proguard:proguard
+          mv ./target/scala-2.11/proguard/libinteractive_2.11-*.jar \
+             ./target/scala-2.11/proguard/libinteractive.jar
+
+      - name: Create Release
+        id: create-release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ steps.bump-version.outputs.tag }}
+          release_name: ${{ steps.bump-version.outputs.tag }}
+          draft: false
+          prerelease: false
+
+      - name: Upload libinteractive.jar Release Asset
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create-release.outputs.upload_url }}
+          asset_path: ./target/scala-2.11/proguard/libinteractive.jar
+          asset_name: libinteractive.jar
+          asset_content_type: application/octet-stream