Deal with Lowercase answers

[masterzorag]

https://github.com/nmilosev/anyfed/blob/ccb747c288c42a4cd0c16299f2c5d20462dfccc8/anyfed#L117

If user just reply 'y' (lowercase), the script will be prepared for using proot (as user), falling then in a chain of issues in the chroot install

Faced many errors about cpio when installing via dnf, I suggest to catch the wrong lowercase answer in some way

[masterzorag]

issue #5 seems potentially related