[Feature] Bump version to 1.3.1.

Author: zhanghai

app/build.gradle

@@ -38,8 +38,8 @@ android {
         applicationId 'me.zhanghai.android.files'
         minSdkVersion 21
         targetSdkVersion 29
-        versionCode 24
-        versionName '1.3.0'
+        versionCode 25
+        versionName '1.3.1'
         resValue 'string', 'app_version', versionName + ' (' + versionCode + ')'
         buildConfigField 'String', 'FILE_PROVIDIER_AUTHORITY', 'APPLICATION_ID + ".file_provider"'
         resValue 'string', 'app_provider_authority', applicationId + '.app_provider'