Fix all linter errors and fix export statements

.babelrc

@@ -3,7 +3,7 @@
     "transform-runtime"
   ],
   "presets": [
-    "es2015",
+    "env",
     "stage-3",
   ]
 }

index.js

@@ -1,3 +1,9 @@
-const middleware = require('./lib');
+import logger from './lib/logger';
+import methods from './lib/methods';
+import response from './lib/response';
 
-module.exports = middleware;
+module.exports = {
+  logger,
+  methods,
+  response,
+};

test/index.test.js

@@ -1,4 +1,5 @@
-const expect = require('chai').expect;
+const { expect } = require('chai');
+
 const swatchKoaMiddleware = require('..');
 
 describe('index', () => {

test/logger/index.test.js

@@ -1,10 +1,8 @@
 const bunyan = require('bunyan');
-const chai = require('chai');
+const { expect } = require('chai');
 
 const logger = require('../../lib/logger');
 
-const expect = chai.expect;
-
 describe('logger', () => {
   it('should use the provided logger', (done) => {
     const testLogger = bunyan.createLogger({

test/methods/index.test.js

@@ -1,4 +1,5 @@
-const expect = require('chai').expect;
+const { expect } = require('chai');
+
 const methods = require('../../lib/methods');
 
 describe('methods', () => {

test/response/index.test.js

@@ -1,10 +1,8 @@
 const bunyan = require('bunyan');
-const chai = require('chai');
+const { expect } = require('chai');
 
 const response = require('../../lib/response');
 
-const expect = chai.expect;
-
 const logger = bunyan.createLogger({
   name: 'swatch-koa-test',
   streams: [{ path: '/dev/null' }],