Bump version to 0.2.20

Author: Trolldemorted

Signal-Windows/Package.appxmanifest

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Package xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10" xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest" xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10" IgnorableNamespaces="uap mp">
-  <Identity Name="2383BenediktRadtke.SignalPrivateMessenger" Publisher="CN=83951ACF-6CF8-48C5-BDC4-D778CAFD26C0" Version="0.2.19.0" />
+  <Identity Name="2383BenediktRadtke.SignalPrivateMessenger" Publisher="CN=83951ACF-6CF8-48C5-BDC4-D778CAFD26C0" Version="0.2.20.0" />
   <mp:PhoneIdentity PhoneProductId="25d58032-97d6-4555-96ed-ffe17d57a51f" PhonePublisherId="00000000-0000-0000-0000-000000000000" />
   <Properties>
     <DisplayName>Signal Private Messenger</DisplayName>