Add link to edge alongside the other browsers (#743)

The link goes to the page where Edge can be downloaded for Windows 7/8/10 and macOS.
The IPFS extension was shown to work in #353

README.md

@@ -11,7 +11,7 @@
 [![codecov](https://codecov.io/gh/ipfs-shipyard/ipfs-companion/branch/master/graph/badge.svg)](https://codecov.io/gh/ipfs-shipyard/ipfs-companion)
 [![#ipfs-in-web-browsers](https://img.shields.io/badge/irc-%23ipfs--in--web--browsers-808080.svg)](https://webchat.freenode.net/?channels=ipfs-in-web-browsers)
 
-| <img src="https://unpkg.com/@browser-logos/firefox@2.0.0/firefox_16x16.png" width="16" height="16"> [Firefox](https://www.mozilla.org/firefox/new/) / [Firefox for Android](https://play.google.com/store/apps/details?id=org.mozilla.firefox) | <img src="https://unpkg.com/@browser-logos/chrome@1.0.4/chrome_16x16.png" width="16" height="16"> [Chrome](https://www.google.com/chrome/) / <img src="https://unpkg.com/@browser-logos/brave@3.0.0/brave_16x16.png" width="16" height="16"> [Brave](https://brave.com/) / <img src="https://unpkg.com/@browser-logos/opera@1.1.1/opera_16x16.png" width="16" height="16"> [Opera](https://www.opera.com/)
+| <img src="https://unpkg.com/@browser-logos/firefox@2.0.0/firefox_16x16.png" width="16" height="16"> [Firefox](https://www.mozilla.org/firefox/new/) / [Firefox for Android](https://play.google.com/store/apps/details?id=org.mozilla.firefox) | <img src="https://unpkg.com/@browser-logos/chrome@1.0.4/chrome_16x16.png" width="16" height="16"> [Chrome](https://www.google.com/chrome/) / <img src="https://unpkg.com/@browser-logos/brave@3.0.0/brave_16x16.png" width="16" height="16"> [Brave](https://brave.com/) / <img src="https://unpkg.com/@browser-logos/opera@1.1.1/opera_16x16.png" width="16" height="16"> [Opera](https://www.opera.com/)  / <img src="https://unpkg.com/@browser-logos/edge@1.0.6/edge_16x16.png" width="16" height="16"> [Microsoft Edge](https://www.microsoftedgeinsider.com/)
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 | [![Install From AMO](https://ipfs.io/ipfs/QmSX44XockQifmxE8Wdevkaa6vaqTXtGdH9t9aHWXZkuJq)](https://addons.mozilla.org/firefox/addon/ipfs-companion/) | [![Install from Chrome Store](https://ipfs.io/ipfs/QmPinSJKFYCMuTDh484dLk5Av4HpZRzBRR1KPv7TM7CBVF)](https://chrome.google.com/webstore/detail/ipfs-companion/nibjojkomfdiaoajekhjakgkdhaomnch) |