Adding tests on Symfony5

Author: Nyholm

.travis.yml

@@ -8,10 +8,12 @@ cache:
 matrix:
     fast_finish: true
     include:
-        - php: 7.1
+        - php: 7.4snapshot
           env: SKELETON_VERSION="^3.4"
-        - php: 7.1
-          env: SKELETON_VERSION="^4.0"
+        - php: 7.4snapshot
+          env: SKELETON_VERSION="^4.4"
+        - php: 7.4snapshot
+          env: SKELETON_VERSION="^5.0"
 
 before_install:
     - phpenv config-rm xdebug.ini || true