docs: update README.md (#205)

Author: koyashiro

README.md

@@ -2,14 +2,25 @@
 
 ## Installation
 
+### Using cargo
+
 ```sh
 cargo install --locked --git https://github.com/koyashiro/vpm-repos-gen
 ```
 
+### Prebuilt binaries
+
+<https://github.com/koyashiro/vpm-repos-gen/releases/latest>
+
 ## Example
 
 ```sh
-vpm-repos-gen --name "koyashiro" --author 'koyashiro' --url 'https://vpm.koyashiro.net/repos.json' --id 'net.koyashiro.vpm' --repos 'koyashiro/udon-list,koyashiro/udon-dictionary'
+vpm-repos-gen \
+  --name 'koyashiro' \
+  --author 'koyashiro' \
+  --url 'https://vpm.koyashiro.net/repos.json' \
+  --id 'net.koyashiro.vpm' \
+  --repos 'koyashiro/udon-list,koyashiro/udon-dictionary'
 ```
 
 <details>