CI: switch to GitHub Actions

.github/workflows/.editorconfig

@@ -0,0 +1,2 @@
+[*.yml]
+indent_size = 2

.github/workflows/CI.yml

@@ -0,0 +1,38 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+
+jobs:
+  run-tests:
+    name: Run test cases
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        go: [1.15, 1.14]
+        os: [ubuntu-latest, macos-latest]
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ matrix.go }}
+
+      - name: Run tests
+        run: |
+          go test -integration -v ./...
+          go test -testserver -v ./...
+          go test -integration -testserver -v ./...
+          go test -integration -allocator -v ./...
+          go test -testserver -allocator -v ./...
+          go test -integration -testserver -allocator -v ./...
+          go test -race -integration -v ./...
+          go test -race -testserver -v ./...
+          go test -race -integration -testserver -v ./...
+          go test -race -integration -allocator -v ./...
+          go test -race -testserver -allocator -v ./...
+          go test -race -integration -allocator -testserver -v ./...

README.md

@@ -5,7 +5,7 @@ The `sftp` package provides support for file system operations on remote ssh
 servers using the SFTP subsystem. It also implements an SFTP server for serving
 files from the filesystem.
 
-[![UNIX Build Status](https://travis-ci.org/pkg/sftp.svg?branch=master)](https://travis-ci.org/pkg/sftp) [![GoDoc](http://godoc.org/github.com/pkg/sftp?status.svg)](http://godoc.org/github.com/pkg/sftp)
+![CI Status](https://github.com/pkg/sftp/workflows/CI/badge.svg?branch=master&event=push) [![GoDoc](http://godoc.org/github.com/pkg/sftp?status.svg)](http://godoc.org/github.com/pkg/sftp)
 
 usage and examples
 ------------------