[etherpad-web] Revert "Bump etherpad release to 1.8"

[Andrea Veri <averi src gnome org>]

commit dc0237b0352b0254df8927ee91a88d2052b65fd7
Author: Andrea Veri <averi redhat com>
Date:   Thu Nov 28 23:52:03 2019 +0100

    Revert "Bump etherpad release to 1.8"
    
    This reverts commit e44f2eee61c09bdf45c3a1df221a5f0f5eb70d8a.

 Dockerfile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/Dockerfile b/Dockerfile
index fd39d07..eab13b8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 FROM centos:7
 MAINTAINER Wolfgang Kulhanek <WolfgangKulhanek gmail com>
-ARG ETHERPAD_VERSION="1.8"
+ARG ETHERPAD_VERSION="1.7.5"
 
 LABEL name="Etherpad Lite" \
       io.k8s.display-name="Etherpad Lite" \