update packages to latest version

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

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+npm-pack(3) -- Create a tarball from a package
+==============================================
+
+## SYNOPSIS
+
+    npm.commands.pack([packages,] callback)
+
+## DESCRIPTION
+
+For anything that's installable (that is, a package folder, tarball,
+tarball url, name@tag, name@version, or name), this command will fetch
+it to the cache, and then copy the tarball to the current working
+directory as `<name>-<version>.tgz`, and then write the filenames out to
+stdout.
+
+If the same package is specified multiple times, then the file will be
+overwritten the second time.
+
+If no arguments are supplied, then npm packs the current package folder.