Add better error message

src/twit2blog.nim

@@ -27,8 +27,7 @@ when isMainModule:
     twitterParams["thread"] = twitterParams["t"]
 
   if not (twitterParams.hasKey("user") and twitterParams.hasKey("thread")):
-    echo twitterParams
-    stderr.writeLine("Invalid Arguments.")
+    stderr.writeLine("Invalid Arguments. Must provide both --user and --thread (or -u and -t). E.g. -u:foo -t:123")
     quit(1)
 
   for tweet in twitterParams["thread"].getThread(twitterParams["user"]):