cos upgrade to 2020.4

pom.xml

@@ -172,7 +172,7 @@
 		<dependency>
 			<groupId>com.jfinal</groupId>
 			<artifactId>cos</artifactId>
-			<version>2019.8</version>
+			<version>2020.4</version>
 			<scope>provided</scope>
 		</dependency>
 		

src/main/java/com/jfinal/upload/ExceededSizeException.java

@@ -6,13 +6,17 @@ package com.jfinal.upload;
  * com.oreilly.servlet.multipart.MultipartParser 中会抛出以下异常
  * throw new ExceededSizeException("Posted content length of " + length + " exceeds limit of " + maxSize);
  */
-public class ExceededSizeException extends RuntimeException {
+public class ExceededSizeException extends com.oreilly.servlet.multipart.ExceededSizeException {
 	
 	private static final long serialVersionUID = -3493615798872340918L;
 	
-	ExceededSizeException(Throwable t) {
+	public ExceededSizeException(Throwable t) {
 		super(t);
 	}
+	
+	public ExceededSizeException(String s) {
+		super(s);
+	}
 }