chore: move to circleci

Author: schickling

.circleci/config.yml

@@ -0,0 +1,11 @@
+version: 2
+jobs:
+  build:
+    docker:
+      - image: circleci/node
+    steps:
+      - checkout
+      - run: sudo npm install -g yarn semantic-release@12.0.0
+      - run: yarn install
+      - run: yarn test
+      - run: semantic-release

.travis.yml

@@ -1,6 +1,6 @@
 # GraphQL Binding for GitHub
 
-[![Build Status](https://travis-ci.org/graphcool/graphql-binding-github.svg?branch=master)](https://travis-ci.org/graphcool/graphql-binding-github) [![npm version](https://badge.fury.io/js/graphql-binding-github.svg)](https://badge.fury.io/js/graphql-binding-github)
+[![CircleCI](https://circleci.com/gh/graphcool/graphql-binding-github.svg?style=shield)](https://circleci.com/gh/graphcool/graphql-binding-github) [![npm version](https://badge.fury.io/js/graphql-binding-github.svg)](https://badge.fury.io/js/graphql-binding-github)
 
 Embed GitHub's GraphQL API into your server application