Update dependencies, .travis.yml and fix xo warns

Author: dimapaloskin

.travis.yml

@@ -1,9 +1,11 @@
 language: node_js
 node_js:
-  - 7
+  - 8
+  - 9
 cache:
   directories:
     - $HOME/.npm
     - node_modules
 before_script:
-  npm install micro
+  - npm install micro
+  - npm install

example.js

@@ -1,5 +1,5 @@
 const { send } = require('micro');
-const microAuthTwitter = require('./');
+const microAuthTwitter = require('.');
 
 const options = {
   consumerKey: 'CONSUMER_KEY',

package.json

@@ -20,10 +20,10 @@
   },
   "devDependencies": {
     "eslint-config-prettier": "^2.0.0",
-    "xo": "^0.18.1"
+    "xo": "^0.20.2"
   },
   "peerDependencies": {
-    "micro": "^7.3.1"
+    "micro": "^9.1.0"
   },
   "xo": {
     "spaces": 2,