diesel_codegen-0.6.2 does not work with aster 0.19

[flosse]

...beacause the function original_span was removed:

serde-deprecated/syntex@462e43f#diff-2c9271f6ccbdf2bec8f5f03e261a0b2cL606

update:
It is caused by this call:
https://github.com/diesel-rs/diesel/blob/master/diesel_codegen/src/schema_inference/sqlite.rs#L48

[sgrif]

Thank you for the report. Because keeping up with nightly perpetually causes a lot of churn, our policy is currently that we will support nightlies on the dates that Rust releases. This means that the next nightly we will support will be on July 7th (because I am at a conference, it may not get updated until a few days after that date, but that will be the date we target). Thanks for your patience and understanding.