Add Python 3.7 requirement clarification to the readme_template.

diff --git a/readme_template.md b/readme_template.md
index aba6aeb32e02c9b46803af5f5fd4c3fa26e12a06..09c485c06b76428c14eee818c09751efb7e3ac0c 100644 (file)
--- a/readme_template.md
+++ b/readme_template.md
@@ -61,6 +61,8 @@ Data for extensions is stored in the [`extensions`](https://github.com/StevenBla
 
 ## Generate your own unified hosts file
 
+To generate your own unified hosts file you will need Python 3.7 or later.
+
 First install the dependencies with:
 
     pip3 install --user -r requirements.txt