Retain one constructor exception

Author: bitwiseman

src/main/java/org/kohsuke/github/extras/HttpClientGitHubConnector.java

@@ -1,5 +1,6 @@
 package org.kohsuke.github.extras;
 
+import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 import org.kohsuke.github.connector.GitHubConnector;
 import org.kohsuke.github.connector.GitHubConnectorRequest;
 import org.kohsuke.github.connector.GitHubConnectorResponse;
@@ -11,12 +12,14 @@
  *
  * @author Liam Newman
  */
+@SuppressFBWarnings(value = { "CT_CONSTRUCTOR_THROW" }, justification = "Basic validation")
 public class HttpClientGitHubConnector implements GitHubConnector {
 
     /**
      * Instantiates a new Impatient http connector.
      */
     public HttpClientGitHubConnector() {
+        throw new UnsupportedOperationException("java.net.http.HttpClient is only supported in Java 11+.");
     }
 
     @Override