I was hunting around the net for a solution to this little bugger. The solution i found is quite a simple one. If there is a better way, be sure to let me know in the comments. Here is a step by step on how to fix this issue.
You want to open up your index.html within your src folder and in your <Header /> tag and add the following:
<link rel="shortcut icon" href="../src/assets/img/favicon.ico">
It should look a little something like this your index.html
I believe that it is best practice to use an ICO formatted icon for cross browser functionality. If using a png, you can use just about any online ico converter.