Swithc to GitHub actions

Author: matklad

.github/workflows/ci.yaml

@@ -0,0 +1,36 @@
+name: CI
+on:
+  pull_request:
+  push:
+    branches:
+    - master
+    - staging
+    - trying
+
+jobs:
+  rust:
+    name: Rust
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+
+    env:
+      RUSTFLAGS: -D warnings
+      RUSTUP_MAX_RETRIES: 10
+      CARGO_NET_RETRY: 10
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Install Rust toolchain
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: stable
+        profile: minimal
+
+    - name: Test
+      run: cargo test --features serde

.travis.yml

@@ -0,0 +1,6 @@
+status = [
+    "Rust (ubuntu-latest)",
+    "Rust (windows-latest)",
+    "Rust (macos-latest)",
+]
+delete_merged_branches = true