have docs.rs document the optional features

TDHolmes · TDHolmes · commit 58e020a28719 · 2022-01-17T11:31:40.000-08:00
diff --git a/Cargo.toml b/Cargo.toml
@@ -64,3 +64,6 @@ version = "0.1"
 [dependencies.defmt]
 version = ">=0.2.0,<0.4"
 optional = true
+
+[package.metadata.docs.rs]
+all-features = true
