v0.8.1

• Breaking change (lottie) Improved interface to take a destination file name rather than returning bytes. The method was internally using a file anyway, so forcing reading it into memory was a waste.
• (ffmpeg) Added ConvertPathWithDestination to specify destination file manually.
• (exhttp) Added utility for applying middlewares to any HTTP handler.
• (exfmt) Made duration formatting more customizable.
• (dbutil) Changed table existence checks during schema upgrades to properly return errors instead of panicking.
• (dbutil) Fixed sqlite-fkey-off transaction mode.