A “drive-by fix” :wink:  While writing `cask-cli--check-parens` I realized that we actually must not read the file literally, for that bypasses many conversions that we actually want to have, namely coding system conversion (that is, proper decoding of Unicode, etc.).   Hence, I took the liberty to change this piece.

Yet, that's for a separate commit actually.  I'll remove it from this PR, and commit it to master separately.