Use HTTP update method for WireGuard

WireGuard uses version.gradle, which fdroidserver doesn't support, so
instead just pull it directly off of cgit.

Fixes: #1983

metadata/com.wireguard.android.yml

@@ -390,7 +390,18 @@ Builds:
       - yes
     ndk: r16b
 
+  - versionName: 0.0.20200309
+    versionCode: 465
+    commit: 0.0.20200309
+    subdir: ui
+    submodules: true
+    gradle:
+      - yes
+    ndk: r16b
+
 AutoUpdateMode: Version %v
-UpdateCheckMode: Tags
-CurrentVersion: 0.0.20200206
-CurrentVersionCode: 464
+UpdateCheckMode: HTTP
+UpdateCheckData: https://git.zx2c4.com/wireguard-android/plain/version.gradle?ua=fdroid-update-check|wireguardVersionCode
+    = ([0-9]+)|.|wireguardVersionName = '([0-9.]+)'
+CurrentVersion: 0.0.20200309
+CurrentVersionCode: 465