use GitHub actions instead of Travis

Author: milo

.gitattributes

@@ -1,4 +1,4 @@
-.gitattributes export-ignore
+.github export-ignore
 .gitignore export-ignore
 .travis.yml export-ignore
 composer.json export-ignore

.github/workflows/tests.yml

@@ -0,0 +1,27 @@
+name: Tests
+
+on: [push, pull_request]
+
+jobs:
+    tests:
+        runs-on: ubuntu-latest
+        strategy:
+            fail-fast: false
+            matrix:
+                php: [8.0, 8.1]
+
+        name: PHP ${{ matrix.php }} tests
+        steps:
+            - uses: actions/checkout@v2
+            - uses: shivammathur/setup-php@v2
+              with:
+                    php-version: ${{ matrix.php }}
+                    coverage: none
+
+            - run: composer install --no-progress --prefer-dist
+            - run: vendor/bin/tester tests -s
+            - if: failure()
+              uses: actions/upload-artifact@v2
+              with:
+                  name: output
+                  path: tests/**/output

.travis.yml

@@ -1,7 +1,7 @@
 [GitHub API](https://developer.github.com/v3/) easy access library. Works with cURL, stream or any of your HTTP client.
 
-[![Build Status](https://travis-ci.org/milo/github-api.svg?branch=master)](https://travis-ci.org/milo/github-api)
-[![Downloads last 30 days](https://img.shields.io/packagist/dm/milo/github-api.svg)](https://packagist.org/packages/milo/github-api)
+[![Downloads this Month](https://img.shields.io/packagist/dm/milo/github-api.svg)](https://packagist.org/packages/milo/github-api)
+[![Tests](https://github.com/milo/github-api/actions/workflows/tests.yml/badge.svg?branch=master)](https://github.com/milo/github-api/actions)
 
 
 # Installation