Require compatible SQLite library version

The SQLite library up to at least 3.7.17 won't work with `spinedb_api` as discussed in Spine-project/Spine-Toolbox#1538. On my system I have 3.35.5 which works just fine. Perhaps we should check for compatible version when connecting to a sqlite database? Or add a troubleshooting note to `README.md`? The version can be found with

```python
import sqlite3
sqlite3.sqlite_version
```