Test on PHP 7.4 (#17)

SpacePossum · web-flow · commit c7fe15b54f18 · 2020-01-15T14:04:52.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -18,6 +18,8 @@ matrix:
           env: COMPOSER_FLAGS="--prefer-stable"
         - php: 7.3
           env: COMPOSER_FLAGS="--prefer-stable"
+        - php: 7.4
+          env: COMPOSER_FLAGS="--prefer-stable"
         - php: nightly
           env: COMPOSER_FLAGS="--dev --ignore-platform-reqs"
     allow_failures:
