Bump proc-macro-crate to 1

[eclipseo]

No description provided.

[illicitonion]

Thanks for the PR! It's great to see all our direct deps now being stable >=1.0 releases 🎉

Unfortunately it looks like Travis has stopped running our tests on PRs, so I'm going to quickly dig into that and hopefully get CI working again in the next few hours.

I manually ran some of the tests CI should be running, and found that this PR doesn't currently compile because of an API change in proc-macro-crate - you may want to apply a change along the lines of:

diff --git a/num_enum_derive/src/lib.rs b/num_enum_derive/src/lib.rs
index bc237f5..eb1281d 100644
--- a/num_enum_derive/src/lib.rs
+++ b/num_enum_derive/src/lib.rs
@@ -574,10 +574,17 @@ pub fn derive_try_from_primitive(input: TokenStream) -> TokenStream {
 
 #[cfg(feature = "proc-macro-crate")]
 fn get_crate_name() -> String {
-    ::proc_macro_crate::crate_name("num_enum").unwrap_or_else(|err| {
-        eprintln!("Warning: {}\n    => defaulting to `num_enum`", err,);
-        String::from("num_enum")
-    })
+    match ::proc_macro_crate::crate_name("num_enum") {
+        Ok(::proc_macro_crate::FoundCrate::Name(name)) => name,
+        Ok(::proc_macro_crate::FoundCrate::Itself) => {
+            // This should only happen in our own tests.
+            String::from("num_enum")
+        },
+        Err(err) => {
+            eprintln!("Warning: {}\n    => defaulting to `num_enum`", err);
+            String::from("num_enum")
+        }
+    }
 }
 
 // Don't depend on proc-macro-crate in no_std environments because it causes an awkward dependency

Thanks!

[illicitonion]

Fabulous - thanks!

I have a couple of other changes to make today (which should get CI green again) and then I'll kick off a release - it'll probably be a 0.6.0 release which bumps our minimum supported rust version.

[eclipseo]

Thanks!

[illicitonion]

I released 0.5.2 with this but without the MSRV bump yesterday, by the way! Thanks again for the contribution.