update packages to latest version

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

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+npm-shrinkwrap(3) -- programmatically generate package shrinkwrap file
+====================================================
+
+## SYNOPSIS
+
+    npm.commands.shrinkwrap(args, [silent,] callback)
+
+## DESCRIPTION
+
+This acts much the same ways as shrinkwrapping on the command-line.
+
+This command does not take any arguments, but 'args' must be defined.
+Beyond that, if any arguments are passed in, npm will politely warn that it
+does not take positional arguments.
+
+If the 'silent' parameter is set to true, nothing will be output to the screen,
+but the shrinkwrap file will still be written.
+
+Finally, 'callback' is a function that will be called when the shrinkwrap has
+been saved.