Merge pull request 'Update README' (#15) from 14-readme into master

Reviewed-on: #15

README.md

@@ -5,15 +5,26 @@ Nixpkgs PR status checker.
 ## Example
 
 ```console
-$ nixprstatus 345501                                              
+$ nixprstatus pr 345501         
+ktailctl: 0.18.0 -> 0.18.1
 
+✅ merged
 ✅ master
-❌ nixos-unstable-small
+✅ nixos-unstable-small
-❌ nixos-unstable
+✅ nixos-unstable
 ❌ nixos-24.05
+
+$ nixprstatus --help
+Usage: python -m nixprstatus [OPTIONS] COMMAND [ARGS]...
+
+Options:
+  --install-completion  Install completion for the current shell.
+  --show-completion     Show completion for the current shell, to copy it or
+                        customize the installation.
+  --help                Show this message and exit.
+
+Commands:
+  pr     Get merge status of pull request.
+  since  Return the count of commits that has happened between the two refs.
 ```
 
-## TODO
-
-* Support backported commits
-* JSON output

nixprstatus/__main__.py

@@ -21,7 +21,7 @@ def pr(
         list[str] | None, typer.Option(help="Check specific branch")
     ] = None,
 ):
-    """Get status of pull request"""
+    """Get merge status of pull request."""
     console = Console()
 
     if branches: