Fixes travis, adds PHP 7.1, and removes HHVM (#160)

Author: bshaffer

.gitignore

@@ -2,3 +2,4 @@ vendor
 phpunit.phar
 phpunit.phar.asc
 composer.phar
+composer.lock

.travis.yml

@@ -6,12 +6,9 @@ php:
   - 5.5
   - 5.6
   - 7.0
-  - hhvm
+  - 7.1
 
 sudo: false
 
-before_script:
-  - wget -nc http://getcomposer.org/composer.phar
-  - php composer.phar install
-
-script: phpunit --configuration phpunit.xml.dist
+before_script: composer install
+script: phpunit

composer.json

@@ -23,5 +23,8 @@
             "Firebase\\JWT\\": "src"
         }
     },
-    "minimum-stability": "dev"
+    "minimum-stability": "dev",
+    "require-dev": {
+        "phpunit/phpunit": " 4.8.35"
+    }
 }