readme: update heimdall links (#539)

* as per
https://gitlab.com/BenjaminDobell/Heimdall/-/commit/0abb12b8c0ba501abe3ccbf49dcb6559b27afd42

Author: tsterbak

README.md

@@ -272,7 +272,7 @@ Make sure to check if your issue or PR has already been fixed or implemented **b
 ## Credits
 
 - The [Android SDK Platform Tools](https://developer.android.com/studio/releases/platform-tools) (such as adb and fastboot) are [Apache](https://android.googlesource.com/platform/system/adb/+/refs/heads/master/NOTICE)-licensed universal Android utilities
-- [Heimdall](https://gitlab.com/BenjaminDobell/Heimdall) is an [MIT](https://gitlab.com/BenjaminDobell/Heimdall/-/blob/master/LICENSE)-licensed replacement for the leaked ODIN tool to flash Samsung devices.
+- [Heimdall](https://github.com/Benjamin-Dobell/Heimdall) is an [MIT](https://github.com/Benjamin-Dobell/Heimdall/blob/master/LICENSE)-licensed replacement for the leaked ODIN tool to flash Samsung devices.
 - [`libusb-1.0`](https://github.com/libusb/libusb) is a [LGPL-2.1](https://github.com/libusb/libusb/blob/master/COPYING)-licensed library for USB device access from Linux, macOS, Windows and others.
 - [`copy-partitions-20220613-signed.zip`](https://mirrorbits.lineageos.org/tools/copy-partitions-20220613-signed.zip) The copy-partitions script was created by LineageOS developer erfanoabdi and filipepferraz and released under LGPL. (It's used when the partitions need to be copied before flashing)