Add hyphen in package name

In order to make this package compatible with the naming in the
rest of the organisation I have added a hyphen between the words
in the package name.

Author: mvriel

composer.json

@@ -1,5 +1,5 @@
 {
-    "name": "phpdocumentor/reflectioncommon",
+    "name": "phpdocumentor/reflection-common",
     "keywords": ["phpdoc", "phpDocumentor", "reflection", "static analysis", "FQSEN"],
     "homepage": "http://www.phpdoc.org",
     "description": "Common reflection classes used by phpdocumentor to reflect the code structure",