Remove Travis CI; use GH Actions

.github/workflows/test.yml

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..606cf83
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,32 @@
+name: Test
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        go-version: [1.16.x, 1.17.x]
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - name: Install go
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ matrix.go-version }}
+
+      - name: Check out code
+        uses: actions/checkout@v2
+
+      - name: Test
+        run: go test -count 1 -bench . -benchtime 1x ./...
+
+      - name: Test with -tags purego
+        run: go test -count 1 -bench . -benchtime 1x -tags purego ./...
+
+# TODO: Test on other architectures. Unfortunately only amd64 is supported
+# by GH Actions. We could use QEMU in the meantime.

.travis.yml

diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index e7691fa..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,11 +0,0 @@
-language: go
-arch:
-  - amd64
-  - ppc64le
-go:
-  - "1.x"
-  - master
-env:
-  - TAGS=""
-  - TAGS="-tags purego"
-script: go test $TAGS -v ./...