Update ci.yml

Author: rennokki

.github/workflows/ci.yml

@@ -46,8 +46,12 @@ jobs:
       uses: shivammathur/setup-php@v2
       with:
         php-version: ${{ matrix.php }}
-        extensions: dom, curl, libxml, mbstring, zip, pcntl, pdo, sqlite, pdo_sqlite, bcmath, soap, intl, gd, exif, iconv, yaml
+        extensions: dom, curl, libxml, mbstring, zip, pcntl, pdo, sqlite, pdo_sqlite, bcmath, soap, intl, gd, exif, iconv
         coverage: pcov
+    
+    - name: Install extra extensions
+      run: |
+        pecl install yaml
 
     - uses: actions/cache@v1
       name: Cache dependencies