build: install phpunit 5 and use it

Author: gsdevme

.travis.yml

@@ -18,4 +18,4 @@ before_script:
   - ./src/BeSimple/SoapClient/Tests/bin/axis.sh
 
 script:
-  - phpunit --coverage-text
+  - vendor/bin/phpunit --coverage-text

composer.json

@@ -39,7 +39,8 @@
         "ext-mcrypt": "*",
         "mikey179/vfsstream": "^1.6.5",
         "symfony/filesystem": "^3|^4",
-        "symfony/process": "^3|^4"
+        "symfony/process": "^3|^4",
+        "phpunit/phpunit": "^5"
     },
     "autoload": {
         "psr-0": { "BeSimple\\": "src/" }