Upgrade deps, fix .travis.yml, fix xo warns

Author: dimapaloskin

.travis.yml

@@ -1,9 +1,13 @@
 language: node_js
 node_js:
-  - 7
+  - 8
+  - 9
 cache:
   directories:
     - $HOME/.npm
     - node_modules
 before_script:
   yarn add micro -P
+
+install:
+  yarn install

example.js

@@ -1,5 +1,5 @@
 const { send } = require('micro');
-const microAuthGithub = require('./');
+const microAuthGithub = require('.');
 
 const options = {
   clientId: 'CLIENT_ID',

package.json

@@ -23,7 +23,7 @@
     "uuid": "^3.0.1"
   },
   "peerDependencies": {
-    "micro": "^8.0.4"
+    "micro": "^9.1.0"
   },
   "devDependencies": {
     "eslint-config-prettier": "^2.0.0",