Bump kramdown from 2.1.0 to 2.3.0#15

coolreader18 merged 1 commit intomasterRustPython/rustpython.github.io:masterfrom

dependabot/bundler/kramdown-2.3.0RustPython/rustpython.github.io:dependabot/bundler/kramdown-2.3.0Copy head branch name to clipboard