Run CI for Linux, macOS, and Windows on GitHub Actions

.github/workflows/ci.yml

@@ -0,0 +1,51 @@
+name: CI
+
+on:
+  push:
+    branches: "master"
+    tags: ["*"]
+  pull_request:
+
+jobs:
+  test:
+    name: Julia ${{ matrix.julia-version }} - ${{ matrix.os }} - ${{ matrix.julia-arch }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        julia-version:
+          - "1.3"
+          - "1.4"
+          - "1.5"
+          - "nightly"
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+        julia-arch:
+          - x64
+          - x86
+        # 32-bit Julia binaries are not available on macOS
+        exclude:
+          - os: macOS-latest
+            julia-arch: x86
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: julia-actions/setup-julia@v1
+        with:
+          version: ${{ matrix.julia-version }}
+          arch: ${{ matrix.julia-arch }}
+      - name: Cache artifacts
+        uses: actions/cache@v1
+        env:
+          cache-name: cache-artifacts
+        with:
+          path: ~/.julia/artifacts
+          key: ${{ runner.os }}-test-${{ env.cache-name }}-${{ hashFiles('**/Project.toml') }}
+          restore-keys: |
+            ${{ runner.os }}-test-${{ env.cache-name }}-
+            ${{ runner.os }}-test-
+            ${{ runner.os }}-
+      - uses: julia-actions/julia-buildpkg@latest
+      - uses: julia-actions/julia-runtest@latest

.travis.yml

@@ -1,10 +1,7 @@
 # Documentation: http://docs.travis-ci.com/user/languages/julia/
 language: julia
 os:
-  - linux
   - freebsd
-  - osx
-  - windows
 julia:
   - 1.3
   - 1.4