Update Syncthing to 1.3.1 (4200)

metadata/com.nutomic.syncthingandroid.yml

@@ -1289,6 +1289,25 @@ Builds:
     preassemble:
       - buildNative
 
+  - versionName: 1.3.1
+    versionCode: 4200
+    commit: 1.3.1
+    submodules: true
+    sudo:
+      - apt update || apt update
+      - apt install -y -t testing golang-1.13-go
+      - ln -s /usr/lib/go-1.13 /usr/lib/go
+      - ln -s /usr/lib/go-1.13/bin/go /usr/bin/go
+    gradle:
+      - yes
+    output: app/build/outputs/apk/release/app-release-unsigned.apk
+    prebuild: sed -i -e '/signingConfig/d' app/build.gradle
+    scanignore:
+      - syncthing/src/github.com/syncthing/syncthing/lib/model/testdata
+    ndk: r15c
+    preassemble:
+      - buildNative
+
 MaintainerNotes: |-
     The submodule in syncthing/src/github.com/syncthing/syncthing must be
     pristine, as the version/release information is taken from git.
@@ -1299,5 +1318,5 @@ MaintainerNotes: |-
 
 AutoUpdateMode: Version %v
 UpdateCheckMode: Tags ^[0-9.]*$
-CurrentVersion: 1.3.0
-CurrentVersionCode: 4197
+CurrentVersion: 1.3.1
+CurrentVersionCode: 4200