feat(PULL_REQUEST_TEMPLATE): remove strikethrough
feat(PULL_REQUEST_TEMPLATE): remove strikethrough

This was cumbersome to use, items should simply stay unchecked if not intended to be implemented.

vatesfr/xo-web,lmcro/xo-web,vatesfr/xo-web,lmcro/xo-web,lmcro/xo-web