capitalized message

Author: rydang

src/app/containers/MainContainer.jsx

@@ -54,7 +54,7 @@ function MainContainer() {
     dispatch(setPort(port));
   });
 
-  if (!npmExists) return <div style={{ color: 'black' }}>please install our npm package in your app</div>;
+  if (!npmExists) return <div style={{ color: 'black' }}>Please install our npm package in your app</div>;
   const { viewIndex, sliderIndex, snapshots } = tabs[currentTab];
 
   // if viewIndex is -1, then use the sliderIndex instead