replace codeblock and insert zero width joiner next to stray backticks

- replace simple codeblocks (`) with multiline codeblocks (```)
- add a zero width joiner (U+200D) after every backtick in the message content effectively canceling any formatting done by it

Should fix #17

cogs/logs.py

@@ -211,11 +211,15 @@ class Logs(Cog):
 
         await self.do_spy(after)
 
+        # U+200D is a Zero Width Joiner stopping backticks from breaking the formatting
+        before_content = before.clean_content.replace("`", "`\u200d")
+        after_content = after.clean_content.replace("`", "`\u200d")
+
         log_channel = self.bot.get_channel(config.log_channel)
         msg = "📝 **Message edit**: \n"\
               f"from {self.bot.escape_message(after.author.name)} "\
               f"({after.author.id}), in {after.channel.mention}:\n"\
-              f"`{before.clean_content}` → `{after.clean_content}`"
+              f"```{before.clean_content}``` → ```{after.clean_content}```"
 
         # If resulting message is too long, upload to hastebin
         if len(msg) > 2000: