update to target nrf52840

Revision:
1:f2e3a692717a
Parent:
0:ecd06432fb4b
--- a/mbed.bld	Thu Aug 13 12:23:41 2020 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,1 +0,0 @@
-https://os.mbed.com/users/mbed_official/code/mbed/builds/65be27845400
\ No newline at end of file