Add setter for read-only flag

Allows one to read the session in read-only mode, then disable read-only in order to read it again, obtaining a lock on the session first.

What's Changed

• Add setter for read only flag by @Yonn-Trimoreau in #52

New Contributors

• @Yonn-Trimoreau made their first contribution in #52

Full Changelog: v1.5.0...v1.5.1