Fix auto rename for duplicate video titles (#118)

* Fix `makeUniqueTitle` was not working with (custom) output format
* Add option to skip already existing files
* Update README to include --skip option

Co-authored-by: molikuner <molikuner@gmail.com>

src/CommandLineParser.ts

@@ -79,6 +79,12 @@ export const argv = yargs.options({
         type: 'string',
         default: 'mkv',
         demandOption: false
+    },
+    skip: {
+        describe: 'Skip download if file already exists',
+        type: 'boolean',
+        default: false,
+        demandOption: false
     }
 })
 /**
@@ -207,4 +213,4 @@ function windowsFileExtensionBadBehaviorFix(argv: any) {
     }
 
     return true;
-}
+}