crates.io: add no-std::no-alloc category

this is a new category which represents crates which don't use an
allocator - which is the case here.

Author: rursprung

Cargo.toml

@@ -6,7 +6,7 @@ rust-version = "1.60"
 
 description = "A `no_std` driver for the TB6612FNG motor driver."
 repository = "https://github.com/rursprung/tb6612fng-rs"
-categories = ["embedded", "hardware-support", "no-std"]
+categories = ["embedded", "hardware-support", "no-std", "no-std::no-alloc"]
 keywords = ["tb6612fng", "driver", "motor", "controller", "embedded-hal-driver"]
 license = "MIT OR Apache-2.0"