Fix docker-compose.yml to use correct master branch that has meteor 1.8.1.

docker-compose.yml

@@ -115,7 +115,7 @@ services:
     #image: quay.io/wekan/wekan:meteor-1.8
     # b) For Wekan Meteor 1.6.x version at master/devel/edge branches.
     # Only for Snap and Sandstorm while they are not upgraded yet to Meteor 1.8.x
-    image: quay.io/wekan/wekan:meteor-1.8
+    image: quay.io/wekan/wekan:master
     # c) Using specific Meteor 1.6.x version tag:
     # image: quay.io/wekan/wekan:v1.95
     # c) Using Docker Hub automatic builds https://hub.docker.com/r/wekanteam/wekan