Downgrade PHPUnit from packages sub-tests

split: 20553d4900e0368628f3dbc07735b536ca3b65ff

Author: kylekatarnls

.travis.yml

@@ -14,7 +14,7 @@ matrix:
 
 install:
   - composer self-update
-  - if [[ "$STYLECHECK" != "on" ]]; then composer require phpunit/phpunit phug/split --no-update; fi;
+  - if [[ "$STYLECHECK" != "on" ]]; then composer require phpunit/phpunit:^7 phug/split --no-update; fi;
   - if [[ "$STYLECHECK" = "on" ]]; then composer require squizlabs/php_codesniffer --no-update; fi;
   - composer install
   - |