Update 'README.md'

README.md

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 CustomNoOlderNotifications or CNON for short is the first tweak I ever made
 
 It has been tested on iOS 11 and 12 and works (don't know about iOS 13)
+
+## Installation
+1. Add https://yaypixxo.com/ to your sources in your package manager
+2. Search for and install CustomNoOlderNotifications