规范package，为发布到maven central repository做准备

src/main/java/me/chanjar/weixin/bean/custombuilder/BaseBuilder.java

@@ -0,0 +1,20 @@
+package me.chanjar.weixin.bean.custombuilder;
+
+import me.chanjar.weixin.bean.WxCustomMessage;
+
+public class BaseBuilder<T> {
+  protected String msgtype;
+  protected String toUser;
+
+  public T toUser(String toUser) {
+    this.toUser = toUser;
+    return (T) this;
+  }
+
+  public WxCustomMessage build() {
+    WxCustomMessage m = new WxCustomMessage();
+    m.setMsgtype(this.msgtype);
+    m.setTouser(this.toUser);
+    return m;
+  }
+}