add usage examples for gulp-eslint and webpack-eslint-loader

Examples for usage with gulp and webpack

Closes #4

readme.md

@@ -36,6 +36,41 @@ grunt.loadNpmTasks('grunt-eslint');
 grunt.registerTask('default', ['eslint']);
 ```
 
+### [gulp-eslint](https://github.com/adametry/gulp-eslint)
+
+```js
+const gulp = require('gulp');
+const eslint = require('gulp-eslint');
+
+gulp.task('lint', () =>
+	gulp.src('file.js')
+		.pipe(eslint())
+		.pipe(eslint.format('node_modules/eslint-formatter-pretty'))
+);
+```
+
+### [eslint-loader](https://github.com/MoOx/eslint-loader) *(webpack)*
+
+```js
+module.exports = {
+	entry: ['file.js'],
+	output: {
+		path: 'dist',
+		filename: '[name].js'
+	},
+	module: {
+		loaders: [
+			{
+				test: /\.js$/,
+				loader: 'eslint-loader'
+			}
+		]
+	},
+	eslint: {
+		formatter: require('eslint-formatter-pretty')
+	}
+};
+```
 
 ## Tip