Flag as no_std.

Let's see how long we cam stay as `no_std` to enable possibly
broader usage.

.github/workflows/ci.yml

@@ -40,3 +40,19 @@ jobs:
 
       - name: cargo test
         run: cargo test
+
+  test-no-std:
+    runs-on: ubuntu-latest
+    name: cargo build no_std
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: install stable toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: stable
+          target: thumbv6m-none-eabi
+          components: clippy
+
+      - name: cargo build
+        run: cargo build --target=thumbv6m-none-eabi

Cargo.toml

@@ -5,7 +5,7 @@ authors = ["Bruce Mitchener <[email protected]>"]
 license = "MIT OR Apache-2.0"
 readme = "README.md"
 description = "Convert common things to humanized output. Parse input text in a human-friendly way."
-keywords = ["humanize", "human", "parse", "format"]
+keywords = ["humanize", "human", "parse", "format", "no_std"]
 documentation = "https://endoli.github.io/humanize.rs"
 homepage = "https://github.com/endoli/humanize.rs"
 repository = "https://github.com/endoli/humanize.rs"

src/lib.rs

@@ -39,6 +39,10 @@
 //! assert_eq!(enabled, true);
 //! ```
 //!
+//! # Support for `no_std`
+//!
+//! By default, this crate works without the Rust standard library.
+//!
 //! # Ideas for the Future
 //!
 //! * Actually implement formatting.
@@ -47,6 +51,7 @@
 //! [moment.js]: http://momentjs.com/
 //! ['at' command]: http://www.computerhope.com/unix/uat.htm
 
+#![no_std]
 #![warn(missing_docs)]
 #![deny(
     trivial_numeric_casts,