Update README.md

Author: codeadamca

README.md

@@ -166,7 +166,7 @@ You will need to setup the following circuit using your Arduino:
 1. Using [Arduino Create](https://create.arduino.cc/editor) upload the sketch to your Arduino.
 2. Using the Terminal start your Node.js app using `node app.js`.
 3. Open up a browser and enter the URL `http://localhost:3000/`.
-4. Turn the dial on the Arduino device and watch the red square in the browser.t. 
+4. Turn the dial on the Arduino device and watch the red square in the browser.
 
 ## Tutorial Requirements: