[etherpad-web/oscp-backend] Update to 1.8.5 and install ep_set_title_on_pad

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit 6e74ef800c9a9646be7bbaca8153f3532e9b795a
Author: Bartłomiej Piotrowski <bpiotrowski gnome org>
Date:   Sat Sep 12 18:38:10 2020 +0200

    Update to 1.8.5 and install ep_set_title_on_pad

 Dockerfile | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/Dockerfile b/Dockerfile
index c5f4172..5ee5702 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 FROM node:10-buster-slim
 
-ENV ETHERPAD_VERSION 1.8.4
+ENV ETHERPAD_VERSION 1.8.5
 ENV NODE_ENV production
 
 RUN apt-get update && \
@@ -30,7 +30,8 @@ RUN npm install ep_adminpads \
     ep_spellcheck \
     ep_headings2 \
     ep_font_color \
-    ep_markdown
+    ep_markdown \
+    ep_set_title_on_pad
 
 USER etherpad
 EXPOSE 9001