Add additional pre-commit hooks (#245)

* Add and run end-of-file-fixer
* Add and run trailing-whitespace
* Add and run check-yaml
* Add and run check-json
* Add and run pretty-format-yaml
* Fix comment indentation

pyscriptjs/examples/handtrack/say_hello.html

@@ -8,7 +8,7 @@
 
     <link rel="icon" type="image/png" href="favicon.png" />
     <link rel="stylesheet" href="../../build/pyscript.css" />
-    
+
     <script defer src="../../build/pyscript.js"></script>
   </head>
 
@@ -40,7 +40,7 @@ def toggle_video(evt):
     handTrack.stopVideo(video.element)
     isVideo = False
     update_note.write("Video stopped")
-  
+
 async def start_video():
   global isVideo
   update_note.write("Inside sstart video")
@@ -61,9 +61,9 @@ async def run_detection():
   console.log("in RUN DETECTION: ");
   global model
   global isVideo
-  
+
   console.log("...1")
-  
+
   predictions = await model.detect(video.element)
   console.log("done...1")
   console.log("Predictions: ", predictions);