update monica branch name

monica/content.md

@@ -62,7 +62,7 @@ where `%%REPO%%` is the name of the service in your `docker-compose.yml` file.
 
 ## Configuration using environment variables
 
-The Monica image will use environment variables to setup the application. See [Monica documentation](https://github.com/monicahq/monica/blob/master/.env.example) for common used variables you should setup.
+The Monica image will use environment variables to setup the application. See [Monica documentation](https://github.com/monicahq/monica/blob/main/.env.example) for common used variables you should setup.
 
 ## Running the image with docker-compose
 

monica/license.md

@@ -1 +1 @@
-View [license information](https://github.com/monicahq/monica/blob/master/LICENSE) for the software contained in this image.
+View [license information](https://github.com/monicahq/monica/blob/main/LICENSE) for the software contained in this image.