Drop travis matrix builds for old PHP versions.

Author: sathielemann

.travis.yml

@@ -2,18 +2,9 @@ language: php
 
 matrix:
   include:
-    - php: 5.3
-      dist: precise
-    - php: 5.4
-      dist: precise
-    - php: 5.5
-      dist: precise
-    - php: 5.6
-    - php: 7.0
-    - php: 7.1
-    - php: 7.2
     - php: 7.3
-    - php: 7.4snapshot
+    - php: 7.4
+    - php: 8.0
     - php: nightly
   allow_failures:
     - php: nightly
@@ -36,4 +27,4 @@ script:
 
 after_script:
   - wget https://scrutinizer-ci.com/ocular.phar
-  - php ocular.phar code-coverage:upload --format=php-clover build/clover.xml
+  - php ocular.phar code-coverage:upload --format=php-clover build/clover.xml