Update README.md

Author: amitjangid80

README.md

@@ -699,6 +699,15 @@ TextUtils.replaceTrueOrFalse(string); // this will return int value.
 **/
 TextUtils.replaceNullWithZero(String stringToReplace)
 
+/**
+ * replace null method
+ * this method will replace null with empty space
+ *
+ * @param string - string where you want to replace null
+ * @return it will return empty string
+**/
+TextUtils.replaceNullWithDash(String string)
+
 /**
  * 2018 September 14 - Friday - 12:34 PM
  * remove last char method