qmk_firmware/docs/ChangeLog/20190830/PR6327.md

• Remove KC_DELT alias in favor of KC_DEL
  • KC_DELT was a redundant, undocumented alias for KC_DELETE
  • It has been removed and all its uses replaced with the more common KC_DEL alias
  • Around 90 keymaps (mostly for ErgoDox boards) have been modified as a result