Adds Composer Requirement For PHP Parser Version 0.9

Fixes bug with PHP Documentor with newer versions of PHP Parser, per bug reports phpDocumentor/phpDocumentor#1743 and yiisoft/yii2-apidoc#20

Signed-off-by: Justin Yost <justin@loadsys.com>

Author: justinyost

composer.json

@@ -12,7 +12,8 @@
         "phpunit/phpunit": "~4.1",
         "phpdocumentor/phpdocumentor": "~2.0",
         "psy/psysh": "@stable",
-        "loadsys/loadsys_codesniffer": "~3.0"
+        "loadsys/loadsys_codesniffer": "~3.0",
+        "nikic/php-parser": "~0.9"
     },
     "config": {
         "bin-dir": "bin"
@@ -45,4 +46,4 @@
         "tests-run",
         "vagrant-exec"
     ]
-}
+}