Update coverage badge branch from master to main (#994)

* Update coverage badge branch from `master` to `main`

* Use better wallet example

* Update README.md

remove old legacy browser alternative

README.md

@@ -99,7 +99,7 @@ const openseaSDK = new OpenSeaSDK(provider, {
 
 **NOTE:** Using the sample Infura provider above won't let you authorize transactions, which are needed when approving and trading assets and currency. To make transactions, you need a provider with a private key or mnemonic set.
 
-In a browser with web3 or an extension like [MetaMask](https://metamask.io/) or [Dapper](http://www.meetdapper.com/), you can use `window.ethereum` (or `window.web3.currentProvider` for legacy mobile web3 browsers) to access the native provider. In a Node.js script, you can follow [this example](https://github.com/ProjectOpenSea/opensea-creatures/blob/master/scripts/sell.js) to use a custom mnemonic.
+In a browser with web3 or an extension like [MetaMask](https://metamask.io/) or [Coinbase Wallet](https://www.coinbase.com/wallet), you can use `window.ethereum` to access the native provider.
 
 ### Fetching Assets
 
@@ -668,8 +668,8 @@ yarn link opensea-js # in repo you're working on
 [npm-link]: https://www.npmjs.com/package/opensea-js
 [ci-badge]: https://github.com/ProjectOpenSea/opensea-js/actions/workflows/code-quality.yml/badge.svg
 [ci-link]: https://github.com/ProjectOpenSea/opensea-js/actions/workflows/code-quality.yml
-[coverage-badge]: https://coveralls.io/repos/github/ProjectOpenSea/opensea-js/badge.svg?branch=master
-[coverage-link]: https://coveralls.io/github/ProjectOpenSea/opensea-js?branch=master
+[coverage-badge]: https://coveralls.io/repos/github/ProjectOpenSea/opensea-js/badge.svg?branch=main
+[coverage-link]: https://coveralls.io/github/ProjectOpenSea/opensea-js?branch=main
 [license-badge]: https://img.shields.io/github/license/ProjectOpenSea/opensea-js
 [license-link]: https://github.com/ProjectOpenSea/opensea-js/blob/main/LICENSE
 [docs-badge]: https://img.shields.io/badge/OpenSea.js-documentation-informational