Build for php 7.3 and 7.4

Author: haphan

.travis.yml

@@ -2,6 +2,8 @@ language: php
 
 sudo: false
 
+dist: bionic
+
 cache:
   directories:
     - $HOME/.composer/cache
@@ -11,6 +13,8 @@ matrix:
     - php: 7.0
     - php: 7.1
     - php: 7.2
+    - php: 7.3
+    - php: 7.4
     - php: nightly
   allow_failures:
     - php: nightly