v3.3.1

Update dependencies so that tile-reduce installs cleanly with modern versions of Node.
Includes updated @mapbox/mbtiles which depends on and supports the latest sqlite3 node package.

v3.3.0

• Kill worker processes with SIGHUP instead of SIGTERM so that they'd have a chance to clean up things.
• Update dependencies so that tile-reduce installs cleanly with modern versions of Node.

v3.2.0

• Better error handling.
• Support MBTiles with application/vnd.mapbox-vector-tile MIME-type.
• Updated dependencies.