README.md add docs for GROUPID, fix dperson#78

mgomezdev · Aug 17, 2017 · 8217971 · 8217971
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commit 8217971
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diff --git a/README.md b/README.md
@@ -133,6 +133,7 @@ ENVIRONMENT VARIABLES (only available with `docker run`)
  * `TZ` - As above, set a zoneinfo timezone, IE `EST5EDT`
  * `VPN` - As above, setup a VPN connection
  * `VPNPORT` - As above, setup port forwarding
+ * `GROUPID` - Set the GID for the vpn
 
 ## Examples