docs: update configuration options in readme

Add `testSuitePropertiesFile` and `testSuitePropertiesDirectory`
configuration options to `README.md`.

README.md

@@ -30,7 +30,7 @@ jest --ci --reporters=default --reporters=jest-junit
 ```
 
 ## Usage as testResultsProcessor (deprecated)
-The support for `testResultsProcessor` is only kept for [legacy reasons][test-results-processor] and might be removed in the future. 
+The support for `testResultsProcessor` is only kept for [legacy reasons][test-results-processor] and might be removed in the future.
 You should therefore prefer to configure `jest-junit` as a _reporter_.
 
 Should you still want to, add the following entry to your jest config:
@@ -72,8 +72,10 @@ Reporter options should also be strings exception for suiteNameTemplate, classNa
 | `JEST_JUNIT_INCLUDE_CONSOLE_OUTPUT` | `includeConsoleOutput` | Adds console output to any testSuite that generates stdout during a test run. | `false` | N/A
 | `JEST_JUNIT_INCLUDE_SHORT_CONSOLE_OUTPUT` | `includeShortConsoleOutput` | Adds short console output (only message value) to any testSuite that generates stdout during a test run. | `false` | N/A
 | `JEST_JUNIT_REPORT_TEST_SUITE_ERRORS` | `reportTestSuiteErrors` | Reports test suites that failed to execute altogether as `error`. _Note:_ since the suite name cannot be determined from files that fail to load, it will default to file path.| `false` | N/A
-| `JEST_JUNIT_NO_STACK_TRACE` | `noStackTrace` | Omit stack traces from test failure reports, similar to `jest --noStackTrace` | `false` | N/A 
+| `JEST_JUNIT_NO_STACK_TRACE` | `noStackTrace` | Omit stack traces from test failure reports, similar to `jest --noStackTrace` | `false` | N/A
 | `JEST_USE_PATH_FOR_SUITE_NAME` | `usePathForSuiteName` | **DEPRECATED. Use `suiteNameTemplate` instead.** Use file path as the `name` attribute of `<testsuite>` | `"false"` | N/A
+| `JEST_JUNIT_TEST_SUITE_PROPERTIES_JSON_FILE` | `testSuitePropertiesFile` | Name of the custom testsuite properties file | `"junitProperties.js"` | N/A
+| `JEST_JUNIT_TEST_SUITE_PROPERTIES_DIR` | `testSuitePropertiesDirectory` | Location of the custom testsuite properties file | `process.cwd()` | N/A
 
 
 You can configure these options via the command line as seen below: