chore: php 8 support (#28)

* chore: add php 8 support

* chore: update pipeline

.github/workflows/.pipeline.yml

@@ -13,15 +13,15 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: [ 7.4 ]
+        php: [ 7.4, 8.0 ]
         os: [ ubuntu-20.04 ]
-        wordpress: [ '6.0', latest ]
-        experimental: [ false ]
+        wordpress: [ 6.0.2, latest ]
         include:
-          - php: 8.0
-            os: ubuntu-20.04
-            wordpress: latest
-            experimental: true
+          - experimental: true
+          - experimental: false
+            php: 8.0
+            wordpress: 6.0.2
+
     name: Test - PHP ${{ matrix.php }} - WP ${{ matrix.wordpress }}
 
     steps:
@@ -71,4 +71,4 @@ jobs:
         uses: codecov/codecov-action@v3
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
-        if: matrix.experimental == false
+        if: matrix.experimental == false

composer.json

@@ -20,12 +20,13 @@
       "docs": "https://github.com/pressbooks/pressbooks-stats/wiki"
     },
     "config": {
-      "platform": {
-        "php": "7.4"
-      }
+        "allow-plugins": {
+            "composer/installers": true,
+            "dealerdirect/phpcodesniffer-composer-installer": true
+        }
     },
     "require": {
-      "php": ">=7.4",
+      "php": "^7.4|8.0.*",
       "composer/installers": "^2",
       "phpcompatibility/php-compatibility": "^9.3"
     },