Exclude some builds on PHP 8.0

Only PHPUnit 8.5+ and 9.3+ are compatible with PHP 8.0

Author: michalbundyra

.travis.yml

@@ -42,10 +42,24 @@ php:
 matrix:
   fast_finish: true
   exclude:
+    - php: 8.0
+      env: PHPUNIT_VERSION=~9.2.0
+    - php: 8.0
+      env: PHPUNIT_VERSION=~9.1.0
+    - php: 8.0
+      env: PHPUNIT_VERSION=~9.0.0
+    - php: 8.0
+      env: PHPUNIT_VERSION=~8.4.0
+    - php: 8.0
+      env: PHPUNIT_VERSION=~8.3.0
+    - php: 8.0
+      env: PHPUNIT_VERSION=~8.2.0
     - php: 8.0
       env: PHPUNIT_VERSION=~8.1.0
     - php: 8.0
       env: PHPUNIT_VERSION=~8.0.0
+    - php: 8.0
+      env: PHPUNIT_VERSION=~7.5.0
     - php: 8.0
       env: PHPUNIT_VERSION=~7.4.0
     - php: 8.0