Replace Travis with Circle (#15)

* Create circle.yml
* Delete .travis.yml

README.md

@@ -1,4 +1,4 @@
-# FasterImage [![Build Status](https://img.shields.io/travis/willwashburn/fasterimage/master.svg?style=flat-square)](https://travis-ci.org/willwashburn/fasterimage) [![Coveralls](https://img.shields.io/coveralls/willwashburn/fasterimage.svg?maxAge=259200&style=flat-square)](https://coveralls.io/github/willwashburn/fasterimage) [![Minimum PHP Version](https://img.shields.io/badge/php-%3E%3D%205.4-8892BF.svg?style=flat-square)](https://php.net/) [![Packagist Version](https://img.shields.io/packagist/v/fasterimage/fasterimage.svg?style=flat-square)](https://packagist.org/packages/fasterimage/fasterimage) [![Packagist Downloads](https://img.shields.io/packagist/dt/fasterimage/fasterimage.svg?style=flat-square)](https://packagist.org/packages/fasterimage/fasterimage/stats) [![License](https://img.shields.io/packagist/l/fasterimage/fasterimage.svg?style=flat-square)](https://github.com/willwashburn/fasterimage/LICENSE)
+# FasterImage ![CircleCI (all branches)](https://img.shields.io/circleci/project/github/willwashburn/fasterimage.svg?style=flat-square) [![Coveralls](https://img.shields.io/coveralls/willwashburn/fasterimage.svg?maxAge=259200&style=flat-square)](https://coveralls.io/github/willwashburn/fasterimage) [![Minimum PHP Version](https://img.shields.io/badge/php-%3E%3D%205.4-8892BF.svg?style=flat-square)](https://php.net/) [![Packagist Version](https://img.shields.io/packagist/v/fasterimage/fasterimage.svg?style=flat-square)](https://packagist.org/packages/fasterimage/fasterimage) [![Packagist Downloads](https://img.shields.io/packagist/dt/fasterimage/fasterimage.svg?style=flat-square)](https://packagist.org/packages/fasterimage/fasterimage/stats) [![License](https://img.shields.io/packagist/l/fasterimage/fasterimage.svg?style=flat-square)](https://github.com/willwashburn/fasterimage/LICENSE)
 
 FasterImage finds the dimensions or filetype of a remote image file given its uri by fetching as little as needed, based on the excellent [Ruby implementation by Stephen Sykes](https://github.com/sdsykes/fastimage) and [PHP implementation by Tom Moor](https://github.com/tommoor/fastimage).
 

circle.yml

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+# PHP CircleCI 2.0 configuration file
+#
+# Check https://circleci.com/docs/2.0/language-php/ for more details
+#
+version: 2
+jobs:
+  build:
+    docker:
+      # Specify the version you desire here
+      - image: circleci/php:7.1
+
+    steps:
+      - checkout
+
+      # Download and cache dependencies
+      - restore_cache:
+          keys:
+            # "composer.lock" can be used if it is committed to the repo
+            - v1-dependencies-{{ checksum "composer.json" }}
+            # fallback to using the latest cache if no exact match is found
+            - v1-dependencies-
+
+      - run: mkdir -p build/logs      
+      - run: composer require php-coveralls/php-coveralls && composer install -n --prefer-dist
+
+      - save_cache:
+          key: v1-dependencies-{{ checksum "composer.json" }}
+          paths:
+            - ./vendor
+
+      # run tests with phpunit
+      - run: ./vendor/bin/phpunit
+      - run: ./vendor/bin/php-coveralls --coverage_clover="clover.xml"