Change usage message

README.md

@@ -16,9 +16,9 @@ Usage:
 -t, --tweet    TWEET_ID      Single tweet id to download
 -n, --nbr      NBR           Number of tweets to download
 -i, --img                    Download images only
--g, --gif                    Download gifs only (need ffmpeg)
+-g, --gif                    Download GIFs only (need ffmpeg)
 -v, --video                  Download videos only
--a, --all                    Download images, gifs(need ffmpeg) and videos
+-a, --all                    Download images, GIFs(need ffmpeg) and videos
 -r, --retweet                Download retweet too
 -z, --url                    Print media url without download it
 -R, --retweet-only           Donwload only retweet

twmd.go

@@ -484,9 +484,9 @@ func main() {
 	op.On("-t", "--tweet TWEET_ID", "Single tweet to download", &single)
 	op.On("-n", "--nbr NBR", "Number of tweets to download", &nbr)
 	op.On("-i", "--img", "Download images only", &imgs)
-	op.On("-g", "--gif", "Download GIFs only", &gifs)
+	op.On("-g", "--gif", "Download GIFs only (need ffmpeg)", &gifs)
 	op.On("-v", "--video", "Download videos only", &vidz)
-	op.On("-a", "--all", "Download images and videos", &all)
+	op.On("-a", "--all", "Download images, GIFs(need ffmpeg) and videos", &all)
 	op.On("-r", "--retweet", "Download retweet too", &retweet)
 	op.On("-z", "--url", "Print media url without download it", &urlOnly)
 	op.On("-R", "--retweet-only", "Download only retweet", &onlyrtw)
@@ -526,7 +526,7 @@ func main() {
 		gifs = true
 	}
 	if !vidz && !imgs && !gifs && single == "" {
-		fmt.Println("You must specify what to download. (-i --img) for images, (-g --gif) for gifs, (-v --video) for videos or (-a --all) for both")
+		fmt.Println("You must specify what to download. (-i --img) for images, (-g --gif) for GIFs, (-v --video) for videos or (-a --all) for both")
 		op.Help()
 		os.Exit(1)
 	}