优化JWT自动识别header中的算法，并可自定义header中key的顺序

hutool-jwt/src/test/java/cn/hutool/jwt/IssueI5QRUOTest.java

@@ -0,0 +1,39 @@
+package cn.hutool.jwt;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public class IssueI5QRUOTest {
+
+	@Test
+	public void createTokenTest(){
+		// https://jwt.io/
+
+		// 自定义header顺序
+		final Map<String, Object> header = new LinkedHashMap<String, Object>(){
+			{
+				put(JWTHeader.ALGORITHM, "HS384");
+				put(JWTHeader.TYPE, "JWT");
+			}
+		};
+
+		final Map<String, Object> payload = new LinkedHashMap<String, Object>(){
+			{
+				put("sub", "1234567890");
+				put("name", "John Doe");
+				put("iat", 1516239022);
+			}
+		};
+
+		final String token = JWTUtil.createToken(header, payload, "123456".getBytes());
+		Assert.assertEquals("eyJhbGciOiJIUzM4NCIsInR5cCI6IkpXVCJ9." +
+				"eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ." +
+				"3Ywq9NlR3cBST4nfcdbR-fcZ8374RHzU50X6flKvG-tnWFMalMaHRm3cMpXs1NrZ", token);
+
+		final boolean verify = JWT.of(token).setKey("123456".getBytes()).verify();
+		Assert.assertTrue(verify);
+	}
+}