feat: add -X as a shorthand for --method in HTTP (jsdelivr#120)

cmd/http.go

@@ -75,7 +75,7 @@ Examples:
 	flags.StringVar(&r.ctx.Host, "host", r.ctx.Host, "specify the Host header to add to the request (default host's defined in command target)")
 	flags.StringVar(&r.ctx.Path, "path", r.ctx.Path, "specify the URL pathname (default \"/\")")
 	flags.StringVar(&r.ctx.Query, "query", r.ctx.Query, "specify a query string to add")
-	flags.StringVar(&r.ctx.Method, "method", r.ctx.Method, "specify the HTTP method to use: HEAD or GET (default \"HEAD\")")
+	flags.StringVarP(&r.ctx.Method, "method", "X", r.ctx.Method, "specify the HTTP method to use: HEAD or GET (default \"HEAD\")")
 	flags.StringArrayVarP(&r.ctx.Headers, "header", "H", r.ctx.Headers, "add HTTP headers to the request in the format \"Key: Value\"; to add multiple headers, define the flag for each one separately")
 	flags.BoolVar(&r.ctx.Full, "full", r.ctx.Full, "enable full output when performing an HTTP GET request to display the status, headers, and body")