Fix spelling

What is meant is the possessive pronoun "its" instead of "it is".

src/components/App.js

@@ -62,7 +62,7 @@ export default class App extends React.Component {
           </div>
           <footer className="footer">
             <p>
-              <strong>Like FilePizza?</strong> Support it&apos;s development! <a href="https://commerce.coinbase.com/checkout/247b6ffe-fb4e-47a8-9a76-e6b7ef83ea22" className="donate-button">donate</a>
+              <strong>Like FilePizza?</strong> Support its development! <a href="https://commerce.coinbase.com/checkout/247b6ffe-fb4e-47a8-9a76-e6b7ef83ea22" className="donate-button">donate</a>
             </p>
 
             <p className="byline">