sqlite3 uri-filename examples

[setharnold]

Hello, I'd like to suggest including a few more examples on

http://docs.diesel.rs/diesel/prelude/struct.SqliteConnection.html

to demonstrate how one can (or can't) use the sqlite3 uri-style feature selection.

Thanks

[weiznich]

If you have specific examples in mind please open a PR to add them.

[sgrif]

It's not currently possible. If you'd like to revive #1292 to add this feature, please feel free.