added support of Proxy.NO_PROXY in web service client builder

Author: ernest

src/main/java/com/maxmind/minfraud/WebServiceClient.java

@@ -68,7 +68,7 @@ private WebServiceClient(WebServiceClient.Builder builder) {
                 .setConnectTimeout(builder.connectTimeout)
                 .setSocketTimeout(builder.readTimeout);
 
-        if (builder.proxy != null) {
+        if (builder.proxy != null && builder.proxy != Proxy.NO_PROXY) {
             InetSocketAddress address = (InetSocketAddress) builder.proxy.address();
             HttpHost proxyHost = new HttpHost(address.getHostName(), address.getPort());
             configBuilder.setProxy(proxyHost);