message: Fix casing Cargo.toml
  By convention, capital C is used for Cargo.toml
diff: @@ -15,9 +15,9 @@ fn fibonacci(n: u64) -> u64 {
  }
  ```
  -### Step 1 - Add Dependency to cargo.toml ###
  +### Step 1 - Add Dependency to Cargo.toml ###
  -To enable Criterion.rs benchmarks, add the following to your `cargo.toml` file:
  +To enable Criterion.rs benchmarks, add the following to your `Cargo.toml` file:
  ```toml
  [dev-dependencies]
  