mirage/mirage: PR #1279: Update the README

@0747934

Stages:

• 🟠 x86_64-debian-10-4.13
• 🟡 arm64-debian-10-4.13

History:

• 31/01/2022 19:48 🟠 @736b831 (8m46s)
• 31/01/2022 19:42 🟠 @0747934
• 31/01/2022 18:21 🟡 @148118e (19m52s)