add bitToString info property to solve bit type use issue

pgjdbc/src/main/java/org/postgresql/PGProperty.java

@@ -128,6 +128,12 @@ public enum PGProperty {
   DEFAULT_ROW_FETCH_SIZE("defaultRowFetchSize", "0",
       "Positive number of rows that should be fetched from the database when more rows are needed for ResultSet by each fetch iteration"),
 
+  /**
+   * Use binary format for sending and receiving data if possible.
+   */
+  BIT_TO_STRING("bitToString", "false",
+      "Auto Convert bit or bit(n) to String type in ResultSet.getObject"),
+
   /**
    * Use binary format for sending and receiving data if possible.
    */