fix(eslint): don't lint ignored files (#491)

Filter out files ignored by the eslint config when linting on watched builds.
Before this, ignored files would still be passed to the linter when changed and would trigger warnings in webpack.

Closes #485

Author: andyrooger

src/eslint-reporter/reporter/EsLintReporter.ts

@@ -40,7 +40,8 @@ function createEsLintReporter(configuration: EsLintReporterConfiguration): Repor
             ) &&
             (configuration.options.extensions || []).some((extension) =>
               changedFile.endsWith(extension)
-            )
+            ) &&
+            !engine.isPathIgnored(changedFile)
         );
 
         if (changedAndIncludedFiles.length) {