Find a way to support versions older than 1.13.0

[roblabla]

https://github.com/core-error/core-error/blob/335e1da/src/typeinfo.rs#L46 So while testing the crate, I found out that the implementation of TypeInfo using Any bound instead of 'static causes warnings in the downstream crates if they try to use core_error::Error as a trait object. Specifically, it triggers where_clauses_object_safety. The reason to use Any instead of 'static is that rustc versions older than 1.13.0 had a Reflect bound on the TypeId::of function.

The warning is over-eager: our usage is legit, since Any is implemented on every 'static type. But unfortunately, the compiler doesn't see it, and triggers the warning. This wouldn't be a problem if it triggered the warning within core-error, but it triggers it downstream, in each crate that tries to turn to use a &dyn Error.

I temporarily added a quick n dirty patch that changes implementation based on the compiler version, but that's seriously not great. I'm thinking of dropping support of anything older than 1.13.0 in no_std. That release is 3 years old now. If someone needs it, they can open an issue.

EDIT: I removed the workaround and changed MSRV to 1.13.0 when using no-default-feature. Please upvote this issue if you need this crate to work on older versions. Worth noting that the only rust versions affected are 1.6.0 to 1.12.1. Versions older than 1.6.0 didn't support no_std.

[dtolnay]

FWIW I don't think this is worth caring about.