Setting "concurrency" in .testcaferc.json does not summon several browser instances

[Marketionist]

Steps to reproduce

1. Create a config file and set concurrency there - for example:

   {
   "browsers": "chrome",
   "src": ["tests/**/*.js", "tests/**/*.feature"],
   "screenshots": {
       "path": "tests/screenshots/",
       "takeOnFails": true,
       "pathPattern": "${DATE}_${TIME}/test-${TEST_INDEX}/${USERAGENT}/${FILE_INDEX}.png"
   },
   "quarantineMode": false,
   "stopOnFirstFail": true,
   "skipJsErrors": true,
   "skipUncaughtErrors": true,
   "concurrency": 2,
   "selectorTimeout": 3000,
   "assertionTimeout": 1000,
   "pageLoadTimeout": 1000,
   "disablePageCaching": true
   }

2. Create 2 feature files with some tests
3. Launch the tests with gherkin-testcafe

Actual result Setting "concurrency" in .testcaferc.json does not summon several browser instances - it executes feature files one after another

Note: launching the tests with gherkin-testcafe --concurrency 2 still works ok and summons 2 browser instances

[Marketionist]

Sorry, my bad - forgot to place .testcaferc.json to the root folder. Now works ok, closing the issue.