Script returns with exit code 0 after error

[felixvanoost]

jekyll-kroki returns with an exit code of 0 (success) after an error occurs, leading any upstream scripts that originally called the Jekyll command to ignore the error.

For instance, with the Kroki URL set to https://expired.badssl.com/:

[jekyll-kroki] "SSL_connect returned=1 errno=0 state=error: certificate verify failed (certificate has expired)" in 'render_diagram' on line 76 of /workspaces/jekyll-kroki/lib/jekyll/kroki.rb
$ echo $?
0