Add missing signature

appcast.xml

@@ -10,7 +10,7 @@ https://apollozhu.github.io/Dynamic-Dark-Mode/appcast.xml
 <pubDate>Mon, 23 Sep 2019 13:34:43 -0700</pubDate>
 <sparkle:minimumSystemVersion>10.14</sparkle:minimumSystemVersion>
 <description><![CDATA[<h2>What's New | <a href="https://github.com/ApolloZhu/Dynamic-Dark-Mode/blob/1.5.2/CHANGELOG.md">changelog</a></h2><ul><li>If you live on west coast, Dynamic Dark Mode should now work for you (<a class="issue-link js-issue-link"data-error-text="Failed to load issue title"data-id="414901042"data-permission-text="Issue title is private"data-url="https://github.com/ApolloZhu/Dynamic-Dark-Mode/issues/57"data-hovercard-type="issue"data-hovercard-url="/ApolloZhu/Dynamic-Dark-Mode/issues/57/hovercard"href="https://github.com/ApolloZhu/Dynamic-Dark-Mode/issues/57">#57</a>), thanks to <a class="user-mention"data-hovercard-type="user"data-hovercard-url="/hovercards?user_id=6835876"data-octo-click="hovercard-link-click"data-octo-dimensions="link_type:self"href="https://github.com/paulw11">@paulw11</a></li><li>We can now toggle dark mode even when AppleScript permission went wrong (<a class="issue-link js-issue-link"data-error-text="Failed to load issue title"data-id="493637689"data-permission-text="Issue title is private"data-url="https://github.com/ApolloZhu/Dynamic-Dark-Mode/issues/75"data-hovercard-type="issue"data-hovercard-url="/ApolloZhu/Dynamic-Dark-Mode/issues/75/hovercard"href="https://github.com/ApolloZhu/Dynamic-Dark-Mode/issues/75">#75</a>)</li><li>New French translation from <a class="user-mention"data-hovercard-type="user"data-hovercard-url="/hovercards?user_id=273716"data-octo-click="hovercard-link-click"data-octo-dimensions="link_type:self"href="https://github.com/flayks">@flayks</a>!</li><li>Sparkle for auto update should—finally—work now</li></ul><p><a href="https://crowdin.com/project/dynamic-dark-mode/invite?d=5545k4f6m6k59393g48373u2i473q4i4l4l4j4s223f4n49353e3n45353d30343a31353t663q483a38373"rel="nofollow">Help translate Dynamic Dark Mode</a> | <a href="https://www.producthunt.com/posts/dynamic-dark-mode"rel="nofollow">Upvote on Product Hunt</a></p>]]></description>
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+<enclosure url="https://github.com/ApolloZhu/Dynamic-Dark-Mode/releases/download/1.5.2/Dynamic_Dark_Mode-1.5.2.zip" sparkle:version="1.5.2" sparkle:edSignature="0dm9xcNLLW6yaKQNf5Q7KMuIFRgwGjhCarPgF3QkL4mT7e+YBGYaNJHFKb3A/jwEqx4QDX7rqFjT3SXXd3A7Dg==" length="9369766" type="application/octet-stream"/>
 </item>
 <item>
 <title>1.5.1 - Fixed some bugs and introduced some more</title>