Updated travis config

Author: Toflar

.travis.yml

@@ -1,26 +1,27 @@
 language: php
+dist: xenial
 
 matrix:
   include:
     - php: 5.6
     - php: 5.6
       env: COMPOSER_FLAGS='--prefer-lowest --prefer-stable'
-    - php: 7.0
-    - php: 7.0
-      env: COMPOSER_FLAGS='--prefer-lowest --prefer-stable'
     - php: 7.1
     - php: 7.1
       env: COMPOSER_FLAGS='--prefer-lowest --prefer-stable'
     - php: 7.2
       env: COVERAGE='--coverage-clover build/logs/clover.xml'
     - php: 7.2
       env: COMPOSER_FLAGS='--prefer-lowest --prefer-stable'
+    - php: 7.4snapshot
+    - php: 7.4snapshot
+      env: COMPOSER_FLAGS='--prefer-lowest --prefer-stable'
     - php: nightly
     - php: nightly
       env: COMPOSER_FLAGS='--prefer-lowest --prefer-stable'
-  fast_finish: true
-
-sudo: false
+  allow_failures:
+    - php: 7.4snapshot
+    - php: nightly
 
 before_script:
   - |