update version to 6.2.0

Author: tibbi

app/build.gradle

@@ -14,8 +14,8 @@ android {
         applicationId "com.simplemobiletools.filemanager.pro"
         minSdkVersion 21
         targetSdkVersion 28
-        versionCode 70
-        versionName "6.1.3"
+        versionCode 71
+        versionName "6.2.0"
         multiDexEnabled true
         setProperty("archivesBaseName", "file-manager")
     }