only test actively supported PHP versions

.travis.yml

@@ -1,24 +1,25 @@
 language: php
 
 php:
-  - 7.1
   - 7.2
+  - 7.3
+  - 7.4
 
 env:
-  - SYMFONY_VERSION="2.7.*"
-  - SYMFONY_VERSION="2.8.*"
-  - SYMFONY_VERSION="3.3.*"
-  - SYMFONY_VERSION="3.4.*"
-  - SYMFONY_VERSION="4.0.*"
+  - SYMFONY_VERSION=3.4.*
+  - SYMFONY_VERSION=4.4.*
+  - SYMFONY_VERSION=5.0.*
 
 matrix:
   include:
-    - php: 7.1
+    - php: 7.2
       env: 'COMPOSER_FLAGS="--prefer-stable --prefer-lowest"'
-    - php: 7.1
-      env: SYMFONY_VERSION=''
     - php: 7.2
       env: SYMFONY_VERSION=''
+    - php: 7.3
+      env: SYMFONY_VERSION=''
+    - php: 7.4
+      env: SYMFONY_VERSION=''
 
 before_script:
   - if [ "$SYMFONY_VERSION" != "" ]; then composer --no-update require symfony/http-kernel:${SYMFONY_VERSION}; fi;