Add commit and date info to generated crates

[cr1901]

I don't need this feature as much now, but I know more than once in the past while adding msp430 feature I've forgotten that my changes haven't been incorporated into a release yet.

This means the docs.rs docs are out of date relative to the PAC. I've added some info to the doc string to mention the commit and date that svd2rust was compiled with, and explicitly how to generate up-to-date svd2rust docs.

[rust-highfive]

r? @burrbull

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[Emilgardis]

I like this approach, however, do we need to mention how to generate a "newer" API?

Linking svd2rust repo would be nice though.

Also, I would like it if we switched over to println!("cargo:rustc-env=REV={}", git_rev), but that's another pr.

[cr1901]

@Emilgardis

Also, I would like it if we switched over to println!("cargo:rustc-env=REV={}", git_rev), but that's another pr.

FWIW, msp430_svd uses the vergen crate to do what you described. See its build.rs.

[Emilgardis]

bors r+

[bors]

Build succeeded:

• continuous-integration/travis-ci/push