🎨 优化微信支付v3代码，兼容java7

weixin-java-pay/pom.xml

@@ -13,11 +13,6 @@
   <name>WxJava - PAY Java SDK</name>
   <description>微信支付 Java SDK</description>
 
-  <properties>
-    <maven.compiler.source>1.8</maven.compiler.source>
-    <maven.compiler.target>1.8</maven.compiler.target>
-  </properties>
-
   <dependencies>
     <dependency>
       <groupId>com.github.binarywang</groupId>
@@ -84,6 +79,11 @@
       <groupId>com.google.code.gson</groupId>
       <artifactId>gson</artifactId>
     </dependency>
+    <dependency>
+      <groupId>joda-time</groupId>
+      <artifactId>joda-time</artifactId>
+      <scope>compile</scope>
+    </dependency>
   </dependencies>
 
   <profiles>