🎨 #1549 微信支付证书读取代码优化，支持读取打进jar包里的证书文件

Author: binarywang

weixin-java-pay/src/main/java/com/github/binarywang/wxpay/config/WxPayConfig.java

@@ -145,7 +145,7 @@ public SSLContext initSSLContext() throws WxPayException {
         if (!path.startsWith("/")) {
           path = "/" + path;
         }
-        inputStream = WxPayConfig.class.getResourceAsStream(path);
+        inputStream = Thread.currentThread().getContextClassLoader().getResourceAsStream(path);
         if (inputStream == null) {
           throw new WxPayException(fileNotFoundMsg);
         }