Update 'README.md'

Added mirror link, other improvement

README.md

@@ -34,7 +34,8 @@ All this does not lead into stability issues.
 
 ## Installation:
 
-### first root method (Fennec F-Droid)
+### ROOT METHOD 1 *(file manager)
+(app)*
 
 - I would like to suggest you to use one of these file managers before proceed: [Amaze](https://f-droid.org/en/packages/com.amaze.filemanager/), [Dir](https://f-droid.org/en/packages/com.veniosg.dir) or [Ghost Commander](https://f-droid.org/en/packages/com.ghostsq.commander)
 - Download and install Fennec F-Droid form the official [F-Droid client](https://f-droid.org/FDroid.apk) or from the official [F-Droid Website](https://f-droid.org/en/packages/org.mozilla.fennec_fdroid/)
@@ -48,7 +49,7 @@ All this does not lead into stability issues.
 
 If this doesn't work I suggest you to use **second root method** below.
 
-### second root method (Fennec F-Droid)
+### ROOT METHOD 2 *(app)*
 
 - Download and install Fennec F-Droid form the official [F-Droid client](https://f-droid.org/FDroid.apk) or from the official [F-Droid Website](https://f-droid.org/en/packages/org.mozilla.fennec_fdroid/)
 - Download and install [user.js-updater app](https://github.com/v1nc/user.js-updater/releases)
@@ -56,7 +57,14 @@ If this doesn't work I suggest you to use **second root method** below.
 - Close your browser
 - Open `user.js-updater` app
 - Select the browser you want to apply `user.js` through the `SELECT BROWSER` bar at the top
-- Select `quindecim` as the author
+- Select `custom` and paste in `type custom user.js url` bar this link:
+
+`https://git.nixnet.xyz/quindecim/fennec_user.js/raw/branch/master/user.js`
+
+or this, from mirror:
+
+`https://git.lushka.al/quindecim/fennec_user.js/raw/branch/master/user.js`
+
 - Tap `UPDATE` at the bottom and grant root permission to proceed
 - Start Fennec F-Droid and test if `user.js` was applied browsing to `about:config` and look if `_config.applied` is `true`.