Update .travis.yml

Author: rccrdpccl

.travis.yml

@@ -4,6 +4,8 @@ sudo: false
 
 matrix:
   include:
+  - php: 7.1
+    env: COLLECT_COVERAGE=true VALIDATE_CODING_STYLE=true
   - php: 7.2
     env: COLLECT_COVERAGE=true VALIDATE_CODING_STYLE=true
   - php: 7.3
@@ -29,4 +31,4 @@ script:
 
 after_script:
 - if [ "$COLLECT_COVERAGE" == "true" ]; then wget https://scrutinizer-ci.com/ocular.phar && php ocular.phar code-coverage:upload --format=php-clover build/clover.xml; fi
-- if [ "$VALIDATE_CODING_STYLE" == "true" ]; then composer phpcs; fi
+- if [ "$VALIDATE_CODING_STYLE" == "true" ]; then composer phpcs; fi