use wildcard for ignoring files

.eslintignore

@@ -3,22 +3,4 @@ build
 my-app*
 packages/react-scripts/template
 packages/react-scripts/fixtures
-packages/react-dev-utils/FileSizeReporter.js
-packages/react-dev-utils/InterpolateHtmlPlugin.js
-packages/react-dev-utils/ModuleScopePlugin.js
-packages/react-dev-utils/WatchMissingNodeModulesPlugin.js
-packages/react-dev-utils/WebpackDevServerUtils.js
-packages/react-dev-utils/ansiHTML.js
-packages/react-dev-utils/checkRequiredFiles.js
-packages/react-dev-utils/clearConsole.js
-packages/react-dev-utils/crossSpawn.js
-packages/react-dev-utils/eslintFormatter.js
-packages/react-dev-utils/formatWebpackMessages.js
-packages/react-dev-utils/getProcessForPort.js
-packages/react-dev-utils/inquirer.js
-packages/react-dev-utils/launchEditor.js
-packages/react-dev-utils/noopServiceWorkerMiddleware.js
-packages/react-dev-utils/openBrowser.js
-packages/react-dev-utils/openChrome.applescript
-packages/react-dev-utils/printHostingInstructions.js
-packages/react-dev-utils/webpackHotDevClient.js
+packages/react-dev-utils/*.js

packages/react-dev-utils/.gitignore

@@ -1,19 +1 @@
-/FileSizeReporter.js
-/InterpolateHtmlPlugin.js
-/ModuleScopePlugin.js
-/WatchMissingNodeModulesPlugin.js
-/WebpackDevServerUtils.js
-/ansiHTML.js
-/checkRequiredFiles.js
-/clearConsole.js
-/crossSpawn.js
-/eslintFormatter.js
-/formatWebpackMessages.js
-/getProcessForPort.js
-/inquirer.js
-/launchEditor.js
-/noopServiceWorkerMiddleware.js
-/openBrowser.js
-/openChrome.applescript
-/printHostingInstructions.js
-/webpackHotDevClient.js
+/*.js