Fix broken links

Closes issue #170

README.md

@@ -160,8 +160,8 @@ digitalWrite(0, HIGH);
 ## Write to own flash
 As an alternative for UPDI, MegaCoreX uses Optiboot Flash, a bootloader that supports flash writing within the running application, thanks to the work of [@majekw](https://github.com/majekw).
 This means that content from e.g. a sensor can be stored in the flash memory directly without the need of external memory. Flash memory is much faster than EEPROM, and can handle at least 10 000 write cycles before wear becomes an issue.
-For more information on how it works and how you can use this in you own application, check out the [Serial_read_write](https://github.com/MCUdude/MegaCoreX/blob/master/avr/libraries/Optiboot_flasher/examples/Serial_read_write/Serial_read_write.ino) for a simple proof-of-concept demo, and
-[Flash_put_get](https://github.com/MCUdude/MegaCoreX/blob/master/avr/libraries/Optiboot_flasher/examples/Flash_put_get/Flash_put_get.ino) + [Flash_iterate](https://github.com/MCUdude/MegaCoreX/blob/master/avr/libraries/Optiboot_flasher/examples/Flash_iterate/Flash_iterate.ino) for useful examples on how you can store strings, structs and variables to flash and retrieve then afterwards.
+For more information on how it works and how you can use this in you own application, check out the [Serial_read_write](https://github.com/MCUdude/MegaCoreX/blob/master/megaavr/libraries/Optiboot_flasher/examples/Serial_read_write/Serial_read_write.ino) for a simple proof-of-concept demo, and
+[Flash_put_get](https://github.com/MCUdude/MegaCoreX/blob/master/megaavr/libraries/Optiboot_flasher/examples/Flash_put_get/Flash_put_get.ino) + [Flash_iterate](https://github.com/MCUdude/MegaCoreX/blob/master/megaavr/libraries/Optiboot_flasher/examples/Flash_iterate/Flash_iterate.ino) for useful examples on how you can store strings, structs and variables to flash and retrieve then afterwards.
 
 
 ## Memory-mapped flash