adjust appveyor for global phpunit

Author: ashnazg

appveyor.yml

@@ -48,7 +48,9 @@ install:
   - IF NOT EXIST php-installed.txt type nul >> php-installed.txt
   - cd c:\reflectiondocblock
   - composer install --no-interaction --prefer-dist --no-progress
+  - composer global require phpunit/phpunit
+  - composer global config bin-dir --absolute
 
 test_script:
   - cd c:\reflectiondocblock
-  - vendor/bin/phpunit --no-coverage
+  - c:\Users\appveyor\AppData\Roaming\Composer\vendor\bin\phpunit --no-coverage