Fix example output of npm install command

Issue marijnh#228

Author: marijnh

20_node.txt

@@ -749,7 +749,7 @@ get access to the library:
 $ npm install mime@1.4.0
 npm http GET https://registry.npmjs.org/mime
 npm http 304 https://registry.npmjs.org/mime
-mime@1.2.11 node_modules/mime
+mime@1.4.0 node_modules/mime
 ----
 
 (((404 (HTTP status code))))(((stat function)))When a requested file