Add more PHP versions to travis

Author: pinkeen

.travis.yml

@@ -20,15 +20,17 @@ php:
   - 5.6
   - 7.0
   - 7.4
+  - 8.0
+  - nightly
 
 jobs:
   include:
     # Test PHP 8.0+ only with composer v2 while ignoring platform reqs 
     # so conflicting dependencies like Symfony polyfills are not installed.
     - php: 8.0
-      env: COMPOSER_VERSION="2" IGNORE_PLATFORM_REQS="--ignore-platform-reqs"
+      env: COMPOSER_VERSION="2"
     - php: nightly
-      env: COMPOSER_VERSION="2" IGNORE_PLATFORM_REQS="--ignore-platform-reqs"
+      env: COMPOSER_VERSION="2"
 
 matrix:
   allow_failures: