Add prettier for markdown files

Prettier adds consistent formatting to markdown files.

Preparation to adding a changelog

.github/workflows/CI.yml

@@ -42,9 +42,10 @@ jobs:
       - run: cargo clippy --all-features --locked -- -D warnings
 
   fmt:
-    name: Rustfmt
+    name: Format
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       - run: rustup component add rustfmt
       - run: cargo fmt --all -- --check
+      - run: npx prettier --check "**/*.md"

README.md

@@ -9,14 +9,14 @@ A Rust port of the [pkginfo](https://pypi.org/project/pkginfo/) Python library.
 
 ## Installation
 
-Add it to your ``Cargo.toml``:
+Add it to your `Cargo.toml`:
 
 ```toml
 [dependencies]
 python-pkginfo = "0.6"
 ```
 
-then you are good to go. If you are using Rust 2015 you have to add ``extern crate python_pkginfo`` to your crate root as well.
+then you are good to go. If you are using Rust 2015 you have to add `extern crate python_pkginfo` to your crate root as well.
 
 ## Example