Sponsors: Sync README with website

README.md

@@ -282,8 +282,8 @@ The following companies, organizations, and individuals support ESLint's ongoing
 <h3>Platinum Sponsors</h3>
 <p><a href="https://automattic.com"><img src="https://images.opencollective.com/photomatt/d0ef3e1/logo.png" alt="Automattic" height="undefined"></a></p><h3>Gold Sponsors</h3>
 <p><a href="https://nx.dev"><img src="https://images.opencollective.com/nx/0efbe42/logo.png" alt="Nx (by Nrwl)" height="96"></a> <a href="https://google.com/chrome"><img src="https://images.opencollective.com/chrome/dc55bd4/logo.png" alt="Chrome's Web Framework & Tools Performance Fund" height="96"></a> <a href="https://www.shopify.com"><img src="https://images.opencollective.com/shopify/e780cd4/logo.png" alt="Shopify" height="96"></a> <a href="https://www.salesforce.com"><img src="https://images.opencollective.com/salesforce/ca8f997/logo.png" alt="Salesforce" height="96"></a> <a href="https://www.airbnb.com/"><img src="https://images.opencollective.com/airbnb/d327d66/logo.png" alt="Airbnb" height="96"></a> <a href="https://substack.com/"><img src="https://avatars.githubusercontent.com/u/53023767?v=4" alt="Substack" height="96"></a> <a href="https://aka.ms/microsoftfossfund"><img src="https://avatars.githubusercontent.com/u/67931232?u=7fddc652a464d7151b97e8f108392af7d54fa3e8&v=4" alt="Microsoft FOSS Fund Sponsorships" height="96"></a></p><h3>Silver Sponsors</h3>
-<p><a href="https://retool.com/"><img src="https://images.opencollective.com/retool/98ea68e/logo.png" alt="Retool" height="64"></a> <a href="https://liftoff.io/"><img src="https://images.opencollective.com/liftoff/5c4fa84/logo.png" alt="Liftoff" height="64"></a> <a href="https://www.ampproject.org/"><img src="https://images.opencollective.com/amp/c8a3b25/logo.png" alt="AMP Project" height="64"></a></p><h3>Bronze Sponsors</h3>
-<p><a href="https://papersowl.com/pay-for-research-paper"><img src="https://images.opencollective.com/papersowl2/9ef85ac/logo.png" alt="Papersowl" height="32"></a> <a href="https://writersperhour.com"><img src="https://images.opencollective.com/writersperhour/5787d4b/logo.png" alt="Writers Per Hour" height="32"></a> <a href="https://www.betacalendars.com/march-calendar.html"><img src="https://images.opencollective.com/betacalendars/9334b33/logo.png" alt="March 2021 calendar" height="32"></a> <a href="https://buy.fineproxy.org/eng/"><img src="https://images.opencollective.com/buy-fineproxy-org/b282e39/logo.png" alt="Buy.Fineproxy.Org" height="32"></a> <a href="https://www.crosswordsolver.org/anagram-solver/"><img src="https://images.opencollective.com/anagram-solver/2666271/logo.png" alt="Anagram Solver" height="32"></a> <a href="null"><img src="https://images.opencollective.com/bugsnag-stability-monitoring/c2cef36/logo.png" alt="Bugsnag Stability Monitoring" height="32"></a> <a href="https://mixpanel.com"><img src="https://images.opencollective.com/mixpanel/cd682f7/logo.png" alt="Mixpanel" height="32"></a> <a href="https://www.vpsserver.com"><img src="https://images.opencollective.com/vpsservercom/logo.png" alt="VPS Server" height="32"></a> <a href="https://icons8.com"><img src="https://images.opencollective.com/icons8/7fa1641/logo.png" alt="Icons8: free icons, photos, illustrations, and music" height="32"></a> <a href="https://discordapp.com"><img src="https://images.opencollective.com/discordapp/7e3d9a9/logo.png" alt="Discord" height="32"></a> <a href="https://themeisle.com"><img src="https://images.opencollective.com/themeisle/d5592fe/logo.png" alt="ThemeIsle" height="32"></a> <a href="https://www.firesticktricks.com"><img src="https://images.opencollective.com/fire-stick-tricks/b8fbe2c/logo.png" alt="Fire Stick Tricks" height="32"></a></p>
+<p><a href="https://retool.com/"><img src="https://images.opencollective.com/retool/98ea68e/logo.png" alt="Retool" height="64"></a> <a href="https://liftoff.io/"><img src="https://images.opencollective.com/liftoff/5c4fa84/logo.png" alt="Liftoff" height="64"></a></p><h3>Bronze Sponsors</h3>
+<p><a href="https://www.123calendars.com/may-calendar.html"><img src="https://images.opencollective.com/may-2021-calendar/2565c23/logo.png" alt="May 2021 Calendar" height="32"></a> <a href="https://papersowl.com/pay-for-research-paper"><img src="https://images.opencollective.com/papersowl2/9ef85ac/logo.png" alt="Papersowl" height="32"></a> <a href="https://writersperhour.com"><img src="https://images.opencollective.com/writersperhour/5787d4b/logo.png" alt="Writers Per Hour" height="32"></a> <a href="https://www.betacalendars.com/march-calendar.html"><img src="https://images.opencollective.com/betacalendars/9334b33/logo.png" alt="March 2021 calendar" height="32"></a> <a href="https://buy.fineproxy.org/eng/"><img src="https://images.opencollective.com/buy-fineproxy-org/b282e39/logo.png" alt="Buy.Fineproxy.Org" height="32"></a> <a href="https://www.crosswordsolver.org/anagram-solver/"><img src="https://images.opencollective.com/anagram-solver/2666271/logo.png" alt="Anagram Solver" height="32"></a> <a href="null"><img src="https://images.opencollective.com/bugsnag-stability-monitoring/c2cef36/logo.png" alt="Bugsnag Stability Monitoring" height="32"></a> <a href="https://mixpanel.com"><img src="https://images.opencollective.com/mixpanel/cd682f7/logo.png" alt="Mixpanel" height="32"></a> <a href="https://www.vpsserver.com"><img src="https://images.opencollective.com/vpsservercom/logo.png" alt="VPS Server" height="32"></a> <a href="https://icons8.com"><img src="https://images.opencollective.com/icons8/7fa1641/logo.png" alt="Icons8: free icons, photos, illustrations, and music" height="32"></a> <a href="https://discordapp.com"><img src="https://images.opencollective.com/discordapp/7e3d9a9/logo.png" alt="Discord" height="32"></a> <a href="https://themeisle.com"><img src="https://images.opencollective.com/themeisle/d5592fe/logo.png" alt="ThemeIsle" height="32"></a> <a href="https://www.firesticktricks.com"><img src="https://images.opencollective.com/fire-stick-tricks/b8fbe2c/logo.png" alt="Fire Stick Tricks" height="32"></a></p>
 <!--sponsorsend-->
 
 ## <a name="technology-sponsors"></a>Technology Sponsors