docs: update supported Python version to 3.9+ (#413)

Author: vytas7

src/index.html

@@ -136,7 +136,7 @@ <h1 class="block-title display-1">Falcon</h1>
           </div>
           <h3>Fast</h3>
           <p class="lead">
-            Falcon is a blazing fast, minimalist Python web API framework for building robust app backends and microservices. The framework works great with both asyncio (<a href="https://asgi.readthedocs.io" target="_blank">ASGI</a>) and gevent/meinheld (<a href="https://wsgi.readthedocs.io" target="_blank">WSGI</a>).
+            Falcon is a blazing fast, minimalist Python web API framework for building robust app backends and microservices. The framework works great with both asyncio (<a href="https://asgi.readthedocs.io" target="_blank">ASGI</a>) and <a href="https://wsgi.readthedocs.io" target="_blank">WSGI</a>.
           </p>
         </li>
 
@@ -190,7 +190,7 @@ <h3>Extensible</h3>
           </div>
           <h3>Compatible</h3>
           <p class="lead">
-            Thanks to <a href="https://asgi.readthedocs.io" target="_blank">ASGI</a> and <a href="https://wsgi.readthedocs.io" target="_blank">WSGI</a>, Falcon runs on a large variety of web servers and platforms. Falcon works great with CPython 3.5+. Or try <a href="https://www.pypy.org" target="_blank">PyPy</a> for an extra speed boost!
+            Thanks to <a href="https://asgi.readthedocs.io" target="_blank">ASGI</a> and <a href="https://wsgi.readthedocs.io" target="_blank">WSGI</a>, Falcon runs on a large variety of web servers and platforms. Falcon works great with CPython 3.9+. Or try <a href="https://www.pypy.org" target="_blank">PyPy</a> for an extra speed boost!
           </p>
         </li>
 
@@ -269,7 +269,7 @@ <h1 class="display-4 section-title">Features</h1>
               <li>Idiomatic HTTP error responses</li>
               <li>Straightforward exception handling</li>
               <li>WSGI/ASGI testing helpers and mocks</li>
-              <li>CPython 3.5+ and PyPy 3.5+ support</li>
+              <li>CPython 3.9+ and PyPy 3.9+ support</li>
             </ul>
 
           </div>

webpack-dev.config.js

@@ -54,6 +54,11 @@ const config = {
       }
     ]
   },
+  performance: {
+    maxAssetSize: 5000000,
+    maxEntrypointSize: 5000000,
+    hints: 'warning',
+  },
   plugins: [
     new CleanWebpackPlugin(),
     new CopyPlugin({

webpack-prod.config.js

@@ -54,6 +54,11 @@ const config = {
       }
     ]
   },
+  performance: {
+    maxAssetSize: 500000,
+    maxEntrypointSize: 500000,
+    hints: 'warning', 
+  },
   plugins: [
     new CleanWebpackPlugin(),
     new CopyPlugin({