v4.5.0

• Adds a flat mode to the console renderer, which can be enabled by passing -p flat on the command line. This mode shows the heaviest frame as measured by self-time, which can be useful in some codebases. (#240)
• Adds the ability to save pstats files. This is the file format used by cprofile in the stdlib. It's less detailed than pyinstrument profiles, but it's compatible with more tools. (#236)
• Fixes a detail of the --show-all option - pyinstrument will no longer remove Python-internal frames when this option is supplied. (#239)
• Internally to the HTML renderer, it now uses Svelte to render the frontend, meaning profile HTML files bundle less javascript and so are smaller. (#222)