Switch updates to use HTTPS

letsencrypt has been around for a while now, and I've gained some
confidence that it's not going to go under suddenly

src/SyncTrayzor/App.config

@@ -14,11 +14,11 @@
     </system.net>
 
     <settings>
-      <UpdateApiUrl>http://synctrayzor.antonymale.co.uk/version-check</UpdateApiUrl>
-      <HomepageUrl>http://github.com/canton7/SyncTrayzor</HomepageUrl>
+      <UpdateApiUrl>https://synctrayzor.antonymale.co.uk/version-check</UpdateApiUrl>
+      <HomepageUrl>https://github.com/canton7/SyncTrayzor</HomepageUrl>
       <DirectoryWatcherBackoffMilliseconds>2000</DirectoryWatcherBackoffMilliseconds>
       <DirectoryWatcherFolderExistenceCheckMilliseconds>3000</DirectoryWatcherFolderExistenceCheckMilliseconds>
-      <IssuesUrl>http://github.com/canton7/SyncTrayzor/issues</IssuesUrl>
+      <IssuesUrl>https://github.com/canton7/SyncTrayzor/issues</IssuesUrl>
       <EnableAutostartOnFirstStart>false</EnableAutostartOnFirstStart>
       <CefRemoteDebuggingPort>2004</CefRemoteDebuggingPort>
       <Variant>Portable</Variant>