Add link to the desktop version

Author: krlvm

app/src/main/res/layout/activity_about.xml

@@ -77,6 +77,7 @@
             android:id="@+id/about_copyright"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
+            android:layout_marginTop="16dp"
             android:layout_marginBottom="16dp"
             android:text="(c) krlvm, 2019-2020" />
 

app/src/main/res/values/strings.xml

@@ -102,7 +102,7 @@
     <string name="about_version">Version %1$s&lt;br>&lt;a href="https://raw.githubusercontent.com/krlvm/PowerTunnel-Android/master/LICENSE">MIT License&lt;/a></string>
     <string name="btn_check_for_updates">Check for updates</string>
     <string name="about_powertunnel" translatable="false"><b><a href="https://github.com/krlvm/PowerTunnel-Android">PowerTunnel for Android</a> is made possible by these open-source projects:</b>\n\n<a href="https://github.com/krlvm/PowerTunnel/tree/libertytunnel">LibertyTunnel</a> - base <a href="https://github.com/krlvm/PowerTunnel">PowerTunnel</a> proxy\n<a href="https://github.com/raise-isayan/TunProxy">TunProxy</a> - VPN server and traffic interceptor\n<a href="https://github.com/adamfisk/LittleProxy">LittleProxy</a> with some <a href="https://github.com/krlvm/PowerTunnel-Android/tree/master/app/src/main/java/org/littleshoot/proxy/impl">patches</a> - proxy server\n<a href="https://github.com/dnsjava/dnsjava">dnsjava</a> - DNS library, DoH realization\n<a href="https://github.com/ibauersachs/dnssecjava">dnssecjava</a> - DNSSec realization for dnsjava\n<a href="https://github.com/adamfisk/DNSSEC4J">DNSSEC4J</a> - DNSSec realization for LittleProxy</string>
-    <string name="main_copyright" translatable="false"><b><a href="https://t.me/powertunnel_dpi">Telegram channel</a></b>\n(c) krlvm, 2019-2020</string>
+    <string name="main_copyright" translatable="false"><b><a href="https://t.me/powertunnel_dpi">Telegram channel</a>\n<a href="https://github.com/krlvm/PowerTunnel">PowerTunnel for PC</a></b>\n\n(c) krlvm, 2019-2020</string>
     <string name="title_activity_about">About</string>
     <string name="no_updates">You\'re running the latest version of PowerTunnel</string>
     <string name="no_updates_title">No updates available</string>