update packages to latest version

node_modules/npm/doc/api/npm-update.md

@@ -0,0 +1,18 @@
+npm-update(3) -- Update a package
+=================================
+
+## SYNOPSIS
+
+    npm.commands.update(packages, callback)
+
+# DESCRIPTION
+
+Updates a package, upgrading it to the latest version. It also installs any
+missing packages.
+
+The `packages` argument is an array of packages to update. The `callback`
+parameter will be called when done or when an error occurs.
+
+## SEE ALSO
+
+* npm-update(1)