rename header generation script to avoid composer bin name collisions

Author: KurtThiemann

bin/generate-headers bin/rados-generate-headersbin/generate-headers renamed to bin/rados-generate-headers

@@ -2,7 +2,7 @@
     "name": "aternos/rados-ffi",
     "description": "An object oriented PHP library for using librados with FFI",
     "type": "library",
-    "bin": ["bin/generate-headers"],
+    "bin": ["bin/rados-generate-headers"],
     "require": {
         "ext-ffi": "*"
     },