readme: normalize punctuation

README.md

@@ -22,7 +22,7 @@ you'll need a browser which supports webGL (e.g. chromium).
 
 
 ## Prerequisites
-- run `nix develop` to enter a dev environment.
+- run `nix develop` to enter a dev environment
 - or manually install these dependencies:
   - Python3
   - cadquery
@@ -34,13 +34,13 @@ you'll need a browser which supports webGL (e.g. chromium).
 - the models can be parameterized with environment variables:
   - `CASE_RENDER_PHONE=1`  => render not just the case, but also what it would look like with the phone inside
   - `CASE_RENDER_PHONE_ONLY=1`  => render ONLY the phone, no case
-  - `CASE_BATTERY=<name>`  => design the case to fit a specific battery model, or "none".
+  - `CASE_BATTERY=<name>`  => design the case to fit a specific battery model, or "none"
 
 
 ## Development
 - `./main.py --editor` or `cq-editor ./main.py` to load an interactive GUI
   - press the green play button to render the model
-  - call with `--render-phone` to see how the phone would fit inside the case, or apply any of the environment variables from above.
+  - call with `--render-phone` to see how the phone would fit inside the case, or apply any of the environment variables from above
 
 - CadQuery docs may be found here: <https://cadquery.readthedocs.io/en/latest/quickstart.html>
 
@@ -49,4 +49,4 @@ you'll need a browser which supports webGL (e.g. chromium).
 - print using a flexible material like TPU
 - the "ldtek" battery is sold under a few brands:
   - [Auskang](https://www.amazon.com/Auskang-Portable-5000mAh-Compatible-Android/dp/B093GKX5Z1)
-  - [TNTOR](https://www.amazon.com/TNTOR-Portable-Charger-5000mAh-Compatible/dp/B0C3QH7RYK/)
+  - [TNTOR](https://www.amazon.com/TNTOR-Portable-Charger-5000mAh-Compatible/dp/B0C3QH7RYK)