Appveyor tweaks

appveyor.yml

@@ -10,7 +10,6 @@ environment:
 
 cache:
     - c:\php -> appveyor.yml
-    - .phpunit -> phpunit
 
 init:
     - SET PATH=c:\php;%PATH%
@@ -46,4 +45,4 @@ install:
 
 test_script:
     - cd c:\projects\composer
-    - php phpunit -c tests/complete.phpunit.xml --colors=always
+    - vendor/bin/phpunit -c tests/complete.phpunit.xml --colors=always