Merge pull request #24 from nicolus/fix-xdebug3-ci

Fix CI pipeline

.travis.yml

@@ -13,7 +13,9 @@ matrix:
     - php: 7.1
     - php: 7.2
     - php: 7.3
-    - php: 7.4snapshot
+      dist: precise
+    - php: 7.4
+      dist: trusty
     - php: nightly
   allow_failures:
     - php: nightly
@@ -36,4 +38,4 @@ 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