Update README.md

README.md

@@ -15,6 +15,6 @@ Mini-workshop/tutorial on design of microfabrication layout patterning masks.
         - Documentation [here](https://gdspy.readthedocs.io/en/stable/gettingstarted.html)
         - Install using Pip: `python3 -m pip install gdspy` in command line/terminal
     - tkinter
-        - Optional, used for real-time-ish visualization of patterns.
-        - Documentation [here](https://docs.python.org/3/library/tkinter.html)
-        - Install using Pip: `python3 -m pip install tk` in command line/terminal
+      - Optional, used for real-time-ish visualization of patterns.
+      - Documentation [here](https://docs.python.org/3/library/tkinter.html)
+      - Install using Pip: `python3 -m pip install tk` in command line/terminal