update packages to latest version

node_modules/npm/doc/cli/npm-explore.md

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+npm-explore(1) -- Browse an installed package
+=============================================
+
+## SYNOPSIS
+
+    npm explore <name> [ -- <cmd>]
+
+## DESCRIPTION
+
+Spawn a subshell in the directory of the installed package specified.
+
+If a command is specified, then it is run in the subshell, which then
+immediately terminates.
+
+This is particularly handy in the case of git submodules in the
+`node_modules` folder:
+
+    npm explore some-dependency -- git pull origin master
+
+Note that the package is *not* automatically rebuilt afterwards, so be
+sure to use `npm rebuild <pkg>` if you make any changes.
+
+## CONFIGURATION
+
+### shell
+
+* Default: SHELL environment variable, or "bash" on Posix, or "cmd" on
+  Windows
+* Type: path
+
+The shell to run for the `npm explore` command.
+
+## SEE ALSO
+
+* npm-folders(5)
+* npm-edit(1)
+* npm-rebuild(1)
+* npm-build(1)
+* npm-install(1)