Add redirect versions (#46)

Author: mongoKart

config/redirects

@@ -1,10 +1,11 @@
 define: prefix docs/entity-framework
 define: base https://www.mongodb.com/${prefix}
-define: versions v7.0 v8.0 master
+define: versions v7.0 v8.0 v8.1 v8.2 master
 
 raw: ${prefix}/ -> ${base}/current/
 raw: ${prefix}/stable -> ${base}/current/
 raw: ${prefix}/7.0/ -> ${base}/8.0/
+raw: ${prefix}/master -> ${base}/upcoming/
 
 [v7.0]: ${prefix}/${version}/quick-start -> ${base}/8.0/quick-start/
 [v7.0]: ${prefix}/${version}/quick-reference -> ${base}/8.0/quick-reference/