update sqlite3 to ^4.0.4 to fix build failure on node 10

[robfentress]

Using node v10.13.0 and npm 6.4.1 on macOS Mohave, I got the following build error:

npm ERR! sqlite3@3.1.13 install: node-pre-gyp install --fallback-to-build/

Upgrading the sqlite3 package to ^4.0.4 seemed to fix it. This should probably be changed in package.json.