Use of `object` in 0.3.48 broke support for Rust v1.37

[stevenroose]

It seems that this commit 1ffdc8a added the object dependency which is not compatible with Rust v1.37.

[stevenroose]

Please rollback that change and release 0.3.49 and then release 0.4.0 with this change.

[alexcrichton]

Thanks for the report! The policy of this crate is 2 versions back, however, so this isn't something I'm going to fix. If you'd like to send PRs to crates to lower their required version then that should be ok.