adds support for apiKey-less calls in obth closeDispute and updateDispute

Author: lachy-stripe

src/main/java/com/stripe/model/Charge.java

@@ -213,6 +213,18 @@ public Charge capture() throws AuthenticationException,
 		return this.capture(null, null);
 	}
 
+	public Dispute updateDispute(Map<String, Object> params)
+			throws AuthenticationException, InvalidRequestException,
+			APIConnectionException, CardException, APIException {
+		return this.updateDispute(params, null)
+	}
+
+	public Dispute closeDispute() throws AuthenticationException,
+			InvalidRequestException, APIConnectionException, CardException,
+			APIException {
+		return this.closeDispute(null);
+	}
+
 	public Charge refund(Map<String, Object> params)
 			throws AuthenticationException, InvalidRequestException,
 			APIConnectionException, CardException, APIException {
@@ -292,7 +304,7 @@ public Dispute closeDispute(String apiKey)
 			APIConnectionException, CardException, APIException {
 		return request(
 				RequestMethod.POST,
-				String.format("%s/dispute/close", instanceURL(Charge.class, this.id)),
+				String.format("%s/dispute/close", instanceURL(Charge.class, this.getId())),
 				null, Dispute.class, apiKey);
 	}
 }