chore(doc): update generate UUID link

Author: Thom-x

README.md

@@ -157,7 +157,7 @@ Ex : `-e 'FR24FEED_FR24KEY=0123456789'`
 
 ## ADS-B Exchange
 
-Add the environment variable `ADSBEXCHANGE_UUID` with a UUID generated by <https://www.adsbexchange.com/myip/gen-uuid/>.
+Add the environment variable `ADSBEXCHANGE_UUID` with a UUID generated by <https://www.uuidgenerator.net/>.
 In case of multiple receivers, please use a different UUID for each receiver.
 
 Add the environment variable `SERVICE_ENABLE_ADSBEXCHANGE` and set it to `true`.