Undefined method 'final' for OpenSSL::Digest

[Marvin Ahlgrimm]

Describe the bug
When trying to run a Grip application, it can't be compiled because the method final is not defined for OpenSSL::Digest.

To Reproduce
Steps to reproduce the behavior:

1. Start a new crystal project with crystal init app <app_name>
2. Add Grip dependency to shards.yml, exactly like in the README
3. Copy & Paste the Grip example from the readme to your code
4. See error

Expected behavior
Have a running Grip server running

Desktop (please complete the following information):

• OS: Ubuntu 20.04
• Crystal 0.34.0

[Giorgi Kavrelishvili]

Try updating your Crystal version to 0.35.1