make setUserAgentData public

Author: josler

intercom-java/src/main/java/io/intercom/api/User.java

@@ -433,8 +433,7 @@ public String getUserAgentData() {
         return userAgentData;
     }
 
-    @VisibleForTesting
-    User setUserAgentData(String userAgentData) {
+    public User setUserAgentData(String userAgentData) {
         this.userAgentData = userAgentData;
         return this;
     }