Fixed test and updated status badge

README.md

@@ -1,5 +1,7 @@
 # Common Expression Language (Rust)
 
+[![Rust](https://github.com/clarkmcc/cel-rust/actions/workflows/rust.yml/badge.svg)](https://github.com/clarkmcc/cel-rust/actions/workflows/rust.yml)
+
 The Common Expression Language (CEL) is a non-Turing complete language designed for simplicity, speed, safety, and
 portability. CEL's C-like syntax looks nearly identical to equivalent expressions in C++, Go, Java, and TypeScript. CEL
 is ideal for lightweight expression evaluation when a fully sandboxed scripting language is too resource intensive.
@@ -20,7 +22,9 @@ auth.claims.email_verified && resources.all(r, r.startsWith(auth.claims.email))
 ```
 
 ## Getting Started
-This project includes a CEL-parser and an interpreter which means that it can be used to evaluate CEL-expressions. The library aims to be very simple to use, while still being fast, safe, and customizable.
+
+This project includes a CEL-parser and an interpreter which means that it can be used to evaluate CEL-expressions. The
+library aims to be very simple to use, while still being fast, safe, and customizable.
 
 ```rust
 fn main() {

interpreter/src/duration.rs

@@ -14,12 +14,12 @@ static NANOS_PER_MICRO: f64 = 1e3;
 /// Parses a duration string into a [`Duration`]. Duration strings support the
 /// following grammar:
 ///
-///     DurationString -> Sign? Number Unit String?
-///     Sign           -> '-'
-///     Number         -> Digit+ ('.' Digit+)?
-///     Digit          -> '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9'
-///     Unit           -> 'h' | 'm' | 's' | 'ms' | 'us' | 'ns'
-///     String         -> DurationString
+/// DurationString -> Sign? Number Unit String?
+/// Sign           -> '-'
+/// Number         -> Digit+ ('.' Digit+)?
+/// Digit          -> '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9'
+/// Unit           -> 'h' | 'm' | 's' | 'ms' | 'us' | 'ns'
+/// String         -> DurationString
 ///
 /// # Examples
 /// - `1h` parses as 1 hour