Document incorrectly states SQLite does not support foreign key constraints

[Wichert Akkerman]

The documentation for passive deletes states that ''“ON DELETE” is not supported on SQLite''. As of SQLite 3.6.19 that is no longer true. There is one catch though: you need to explicitly opt-in to foreign key checking by issuing a {{{PRAGMA foreign_keys = ON;}}} statement.

[Mike Bayer]

fine, should be something like "not supported by SQLite in its default mode of usage". Feel free to post a short patch/pull request if you're so inclined.

[Mike Bayer]

b7554b0e2d1536c17f060b421a35c677f88fdb1f

74ae1f76877f3f070f3a3f30b3c52980491013c6

[Mike Bayer]

Removing milestone: 0.7.9 (automated comment)