fix: removed whitespace in subscriptions

Signed-off-by: Pravesh Kunwar <[email protected]>

Author: PraveshKunwar

lib/node_modules/@stdlib/_tools/github/subscriptions/README.md

@@ -205,7 +205,7 @@ function clbk( error, repo, info ) {
 ### Usage
 
 ```bash
-Usage: ghwatching [options] 
+Usage: ghwatching [options]
 
 Options: