fix(demos/simple): confirm it supports EMs

Author: hex22a

demos/simple/index.html

@@ -15,7 +15,7 @@
 <div class="glitch glitch_noise" data-text="You can also change glitch size" data-testid="noise"> You can also change
   glitch size
 </div>
-<div class="glitch glitch_em" data-text="Does this support ems 🤔" data-testid="em">Does this support ems 🤔</div>
+<div class="glitch glitch_em" data-text="Also supports ems 🤔" data-testid="em">Also supports ems 🤔</div>
 <div class="docs"> For more information visit our <a href="https://github.com/hex22a/postcss-glitch/tree/master/plugin#postcss-glitch">GitHub Page</a></div>
 <script type="module" src="index.js"></script>
 </body>