specify language for syntax highlighting in README

README.md

@@ -6,15 +6,17 @@ Markov chain discord bot, sends randomly generated sentences at configurable int
 
 Put some text into `corpus.txt`, and then run
 
-    git clone https://git.xeno.science/xenofem/markov-bot
-    cd markov-bot
-    python3 -m venv env
-    source env/bin/activate
-    pip install discord.py
-    python markov-prep.py
-    cp config.json.example config.json
-    vi config.json
-    python markov-bot.py
+```bash
+git clone https://git.xeno.science/xenofem/markov-bot
+cd markov-bot
+python3 -m venv env
+source env/bin/activate
+pip install discord.py
+python markov-prep.py
+cp config.json.example config.json
+vi config.json
+python markov-bot.py
+```
 
 ## Configuration