Fix tail command off-by-1 error

jarvis/cogs/botutil.py

@@ -23,7 +23,7 @@ class BotutilCog(Scale):
         async with AIOFile("jarvis.log", "r") as af:
             async for line in LineReader(af):
                 lines.append(line)
-                if len(lines) == count:
+                if len(lines) == count + 1:
                     lines.pop(0)
         log = "".join(lines)
         await ctx.reply(content=f"```\n{log}\n```")