travis: added PHP 7.1

Author: dg

.travis.yml

@@ -2,6 +2,7 @@ language: php
 php:
     - 5.6
     - 7.0
+    - 7.1
 
 env:
     - PHP_BIN=php
@@ -14,6 +15,9 @@ matrix:
         - php: 7.0
           env: coverage="--coverage ./coverage.xml --coverage-src ./src" PHP_BIN=phpdbg
 
+    allow_failures:
+        - php: 7.1
+
 script:
     - vendor/bin/tester -p $PHP_BIN tests -s $coverage
     - php temp/code-checker/src/code-checker.php --short-arrays