introduce type-specific variants of custom (and deprecate original custom())

Author: apucacao

src/main/java/com/launchdarkly/client/LDUser.java

@@ -291,8 +291,19 @@ public Builder custom(String k, Boolean b) {
      * @param k the key for the list
      * @param vs the values for the attribute
      * @return the builder
+     * @deprecated As of version 0.16.0, renamed to {@link #customString(String, List<String>)}
      */
     public Builder custom(String k, List<String> vs) {
+      return this.customString(k, vs);
+    }
+    
+    /**
+     * Add a list of {@link java.lang.String}-valued custom attributes
+     * @param k the key for the list
+     * @param vs the values for the attribute
+     * @return the builder
+     */
+    public Builder customString(String k, List<String> vs) {
       JsonArray array = new JsonArray();
       for (String v : vs) {
         if (v != null) {
@@ -309,7 +320,7 @@ public Builder custom(String k, List<String> vs) {
      * @param vs the values for the attribute
      * @return the builder
      */
-    public Builder custom(String k, List<Integer> vs) {
+    public Builder customInt(String k, List<Integer> vs) {
       JsonArray array = new JsonArray();
       for (Integer v : vs) {
         if (v != null) {