update node definitions for os.tmpdir
Closes
/**
* @fileoverview Definitions for node's os module.
* @see http://nodejs.org/api/os.html
+ * @externs
*/
/** @const */
@@ -26,7 +27,7 @@ var os = {};
* @return {string}
* @nosideeffects
*/
-os.tmpDir;
+os.tmpdir;
/**
* @return {string}
