docs: update example (#11)

README.md

@@ -46,7 +46,7 @@ pip install git+https://github.com/markjoshwel/surplus
 ### Command-line Interface
 
 ```text
-usage: surplus [-h] [-d] query [query ...]
+usage: surplus [-h] [-d] [-v] [query ...]
 
 Plus Code to iOS-Shortcuts-like shareable text
 
@@ -57,8 +57,10 @@ positional arguments:
 
 options:
   -h, --help     show this help message and exit
-  -d, --debug  prints lat, long and reverser response
-               dict to stderr
+  -d, --debug    prints lat, long and reverser
+                 response dict to stderr
+  -v, --version  prints version information to stderr
+                 and exits
 ```
 
 ### API Reference