Add Rainbow Extension support

Rainbow now offers a browser extension! Updating our entry to reflect our new support for Chromium and Firefox. 

Rainbow.me download page
https://rainbow.me/download

Chrome webstore
https://chrome.google.com/webstore/detail/rainbow/opfgelmcmbiajamepnmloijbpoleiama

Firefox webstore
https://addons.mozilla.org/en-US/firefox/addon/rainbow-extension/

Author: keccers

src/data/wallets/wallet-data.ts

@@ -1589,8 +1589,8 @@ const walletData: WalletData[] = [
     linux: false,
     windows: false,
     macOS: false,
-    firefox: false,
-    chromium: false,
+    firefox: true,
+    chromium: true,
     hardware: false,
     open_source: true,
     repo_url: "https://github.com/rainbow-me/rainbow",