Update the links of the browser logos in Readme (#616)

Change the links of the logos of different browsers according to the original repository.

Fixes #615

README.md

@@ -21,7 +21,7 @@ Promise based HTTP client for the browser and node.js
 
 ## Browser Support
 
-![Chrome](https://raw.github.com/alrra/browser-logos/master/chrome/chrome_48x48.png) | ![Firefox](https://raw.github.com/alrra/browser-logos/master/firefox/firefox_48x48.png) | ![Safari](https://raw.github.com/alrra/browser-logos/master/safari/safari_48x48.png) | ![Opera](https://raw.github.com/alrra/browser-logos/master/opera/opera_48x48.png) | ![Edge](https://raw.github.com/alrra/browser-logos/master/edge/edge_48x48.png) | ![IE](https://raw.github.com/alrra/browser-logos/master/internet-explorer/internet-explorer_48x48.png) |
+![Chrome](https://raw.github.com/alrra/browser-logos/master/src/chrome/chrome_48x48.png) | ![Firefox](https://raw.github.com/alrra/browser-logos/master/src/firefox/firefox_48x48.png) | ![Safari](https://raw.github.com/alrra/browser-logos/master/src/safari/safari_48x48.png) | ![Opera](https://raw.github.com/alrra/browser-logos/master/src/opera/opera_48x48.png) | ![Edge](https://raw.github.com/alrra/browser-logos/master/src/edge/edge_48x48.png) | ![IE](https://upload.wikimedia.org/wikipedia/commons/thumb/2/2f/Internet_Explorer_10_logo.svg/48px-Internet_Explorer_10_logo.svg.png) |
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