Update mention of default Digital Ocean distro (#6727)

Update mention of default Digital Ocean distro (#6727)

When I last exercised this procedure, the Digital Ocean UI defaulted to
‘Ubuntu 18.04 x64’, not 16.04 as it once did. 18.04 – Bionic Beaver –
is the latest Ubuntu LTS release.

https://wiki.ubuntu.com/Releases

From 5612dbc8c313f5b1d2ee2fa4d3124fe00d5cf1ec Mon Sep 17 00:00:00 2001
From: Saj Goonatilleke <sg@redu.cx>
Date: Thu, 6 Dec 2018 08:54:05 +1100
Subject: [PATCH] Update mention of default Digital Ocean distro (#6727)

When I last exercised this procedure, the Digital Ocean UI defaulted to
'Ubuntu 18.04 x64', not 16.04 as it once did.  18.04 -- Bionic Beaver --
is the latest Ubuntu LTS release.

https://wiki.ubuntu.com/Releases

diff --git a/docs/INSTALL-cloud.md b/docs/INSTALL-cloud.md
index 540b26d..d698947 100644
--- a/docs/INSTALL-cloud.md
+++ b/docs/INSTALL-cloud.md
@@ -6,7 +6,7 @@
 
 [Sign up for DigitalOcean][do], update billing info, then create your new cloud server.
 
-- The default of **Ubuntu 16.04 LTS x64** works fine. At minimum, a 64-bit Linux OS with a kernel version of 3.10+ is required.
+- The default of **Ubuntu 18.04 LTS x64** works fine. At minimum, a 64-bit Linux OS with a kernel version of 3.10+ is required.
 
 - The default of **1 GB** RAM works fine for small Discourse communities. We recommend 2 GB RAM for larger communities.

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