引入WxPayException，替代原有的异常处理类，并做相应的优化

weixin-java-pay/pom.xml

@@ -27,6 +27,12 @@
       <groupId>org.jodd</groupId>
       <artifactId>jodd-http</artifactId>
     </dependency>
+
+    <dependency>
+      <groupId>ch.qos.logback</groupId>
+      <artifactId>logback-classic</artifactId>
+      <scope>test</scope>
+    </dependency>
     <dependency>
       <groupId>org.testng</groupId>
       <artifactId>testng</artifactId>