Update to 0.19.4

Author: IanMcCurdy

package.json

@@ -6,7 +6,7 @@
   ],
   "name": "hdb",
   "description": "SAP HANA Database Client for Node",
-  "version": "0.19.3",
+  "version": "0.19.4",
   "repository": {
     "type": "git",
     "url": "git://github.com/SAP/node-hdb.git"