update packages to latest version

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

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+npm-cache(3) -- manage the npm cache programmatically
+=====================================================
+
+## SYNOPSIS
+
+    npm.commands.cache([args], callback)
+
+    // helpers
+    npm.commands.cache.clean([args], callback)
+    npm.commands.cache.add([args], callback)
+    npm.commands.cache.read(name, version, forceBypass, callback)
+
+## DESCRIPTION
+
+This acts much the same ways as the npm-cache(1) command line
+functionality.
+
+The callback is called with the package.json data of the thing that is
+eventually added to or read from the cache.
+
+The top level `npm.commands.cache(...)` functionality is a public
+interface, and like all commands on the `npm.commands` object, it will
+match the command line behavior exactly.
+
+However, the cache folder structure and the cache helper functions are
+considered **internal** API surface, and as such, may change in future
+releases of npm, potentially without warning or significant version
+incrementation.
+
+Use at your own risk.