Fix typo in release notes

static/release-notes.html

@@ -171,7 +171,7 @@
                     <li>Decentraleyes now officially supports modern versions of SeaMonkey.</li>
                     <li>Created mappings for yastatic.net and deprecated its predecessor (yandex.st).</li>
                     <li>Added test cases, and <span class="help-panel" data-title="With code contributions by Ngksternhagen.">improved existing unit tests</span> and exception handling.</li>
-                    <li>Applied a wide range of performance optimalizations and stability improvements.</li>
+                    <li>Applied a wide range of performance optimizations and stability improvements.</li>
                     <li>Added support for localizations and embedded fourteen initial translations.</li>
                     <li>Implemented a watcher that keeps pages with specific security policies from breaking.</li>
                     <li><span class="help-panel" data-title="With code contributions by Thegoodthings.">Added a preference</span> to allow users to hide release notes upon install and upgrade.</li>