few little changes

plugins/google.lua

@@ -35,4 +35,4 @@ return {
   usage = {"/google [Begriff]","/Google [Begriff]"},
   patterns = {"^/google (.*)$","^/Google (.*)$"},
   run = run
-}
+}

plugins/niissan.lua

@@ -5,7 +5,7 @@ end
 return {
   description = "Nii-san <3", 
   usage = {"nii-san","Nii-san","nissan","Nissan"},
-  patterns = {"^nii-san","^Nii-san","^nissan","^Nissan"}, 
+  patterns = {"^nii-san$","^Nii-san$","^nissan$","^Nissan$"}, 
   run = run 
 }
 --by Akamaru [https://ponywave.de]

plugins/youtube_dl.lua

@@ -8,14 +8,14 @@ end
 function run(msg, matches)
   URL = matches[1]
   local receiver = get_receiver(msg)
-    text = run_bash("youtube-dl -o tmp/video.mp4 " .. URL)
+    text = run_bash("rm tmp/video.mp4 && youtube-dl -o tmp/video.mp4 " .. URL)
 	send_video(get_receiver(msg), "tmp/video.mp4", ok_cb, false)
     return 'Video wird gesendet! \nDas kann je nach Video bis zu 10 Minuten dauern!'
 end
 
 return {
     description = "Downloadet und sendet ein YouTube-Video", 
-    usage = {"/ydl"},
+    usage = {"/ydl [Link]"},
     patterns = {"^/ydl (.*)$"}, 
     run = run
 }