Update travis.yml

.travis.yml

 language: php
 
 php:
-  - 5.6
   - 7
   - 7.1
 

composer.json

@@ -22,7 +22,7 @@
         "orchestra/testbench": "^3.1",
         "mockery/mockery": "^0.9",
         "satooshi/php-coveralls": "^1.0",
-        "doctrine/dbal": "^2.6"
+        "doctrine/dbal": "^2.5"
     },
     "autoload": {
         "psr-0": {