README: added a DEPRECATED notice at the begining

mbideau · web-flow · commit 6f1d15e6e8eb · 2019-11-01T14:27:26.000+01:00
diff --git a/README.md b/README.md
@@ -1,3 +1,9 @@
+# DEPRECATED
+
+See the following ticket for an updated version that works with Redmine 4.x
+http://www.redmine.org/issues/4939
+
+
 # redmine_zquery
 Redmine plugin that allows using simple OR between query filters
 
