fix nightly builds

* update proc-macro2
* fix new warnings

asyncgit/src/lib.rs

@@ -22,7 +22,11 @@
 //TODO: get this in someday since expect still leads us to crashes sometimes
 // #![deny(clippy::expect_used)]
 //TODO: consider cleaning some up and allow specific places
-#![allow(clippy::significant_drop_tightening)]
+#![allow(
+	clippy::significant_drop_tightening,
+	// TODO:
+	clippy::missing_panics_doc
+)]
 
 pub mod asyncjob;
 mod blame;