Streamline fetch and retry process

src/main/java/org/kohsuke/github/GHIOException.java

@@ -31,6 +31,20 @@ public class GHIOException extends IOException {
         super(message);
     }
 
+    /**
+     * Constructs a {@code GHIOException} with the specified detail message and cause.
+     *
+     * @param message
+     *            The detail message (which is saved for later retrieval by the {@link #getMessage()} method)
+     *
+     * @param cause
+     *            The cause (which is saved for later retrieval by the {@link #getCause()} method). (A null value is
+     *            permitted, and indicates that the cause is nonexistent or unknown.)
+     */
+    public GHIOException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
     /**
      * Gets response header fields.
      *