Eldev 1.1.1

This release fixes a couple of Windows-specific bugs in Eldev bootstrapping (Emacs 26) and installation in GitHub workflows.

As a minor improvement, command-line options that accept a number now issue a proper error when their argument cannot be parsed. Previously it would be possible to accidentally supply a different option as an optional argument to the previous one, only for it to silently get ignored by Eldev, e.g.: eldev test -sB.