Update README.md

Author: mapcoding-cn

README.md

@@ -1,5 +1,5 @@
 # mapcoding.cn
-Official website for GIS Learner/China. see http://mapcoding.cn \
+Official website for GIS Learner/China. see https://mapcoding.cn \
 WeChat Public Account: mapcoding
 
 ![image](https://user-images.githubusercontent.com/15833367/160532467-e5e8b097-89f8-4627-90cd-bb2514932872.png)