bumping to version 3.0 (#57)

Author: steveren

config/redirects

@@ -1,6 +1,6 @@
 define: base https://docs.mongodb.com/spark-connector
-define: versions v1.1 v2.0 v2.1 v2.2 v2.3 v2.4 master
-symlink: v2.4 -> master
+define: versions v1.1 v2.0 v2.1 v2.2 v2.3 v2.4 v3.0 master
+symlink: v3.0 -> master
 symlink: current -> master
 
 raw: spark-connector/ -> ${base}/current