updates for v1.3 (#59)

(cherry picked from commit 722dfcc1c8557180bb617f24c801a168da83b3d3)

Author: Chris Cho

config/redirects

@@ -1,7 +1,7 @@
 define: base https://docs.mongodb.com/kafka-connector
-define: versions v1.0 v1.1 v1.2 master
+define: versions v1.0 v1.1 v1.2 v1.3 master
 symlink: upcoming -> master
-symlink: current -> v1.2
+symlink: current -> v1.3
 
 raw: kafka-connector/ -> ${base}/current
 

source/kafka-installation.txt

@@ -81,7 +81,7 @@ Installation Reference Table
 
    * - Uber JAR (Maven Central)
      - `mongo-kafka-connect
-       <https://search.maven.org/artifact/org.mongodb.kafka/mongo-kafka-connect/1.1.0/jar>`__
+       <https://search.maven.org/artifact/org.mongodb.kafka/mongo-kafka-connect>`__
 
    * - Uber JAR (Sonatype OSS)
      - `mongodb-kafka