Update README.md

Make compilation instructions easier to copy

README.md

@@ -20,9 +20,18 @@ This program is licensed under the MIT license which grants you the permission t
 ## Development Help
 
 To compile the extension in debug:
-
-$ python3 -m venv venv
-$ source venv/bin/activate
-$ python -m pip install Cython pytest
-$ python setup.py build_ext -g --inplace --force
-$ python -m pytest
+```bash
+python3 -m venv venv
+```
+```bash
+source venv/bin/activate
+```
+```bash
+python -m pip install Cython pytest
+```
+```bash
+python setup.py build_ext -g --inplace --force
+```
+```bash
+python -m pytest
+```