Unify build status badge look

kevgo · web-flow · commit b60a243ef6fb · 2018-09-05T13:22:39.000-05:00
This makes the CircleCI badge look similar to the other badges.
diff --git a/README.md b/README.md
@@ -1,4 +1,4 @@
-# diff-so-fancy  [![Circle CI build](https://circleci.com/gh/so-fancy/diff-so-fancy.svg?style=svg)](https://circleci.com/gh/so-fancy/diff-so-fancy) [![TravisCI build](https://travis-ci.org/so-fancy/diff-so-fancy.svg?branch=master)](https://travis-ci.org/so-fancy/diff-so-fancy) [![AppVeyor build](https://ci.appveyor.com/api/projects/status/github/so-fancy/diff-so-fancy?branch=master&svg=true)](https://ci.appveyor.com/project/stevemao/diff-so-fancy/branch/master)
+# diff-so-fancy  [![Circle CI build](https://circleci.com/gh/so-fancy/diff-so-fancy.svg?style=shield)](https://circleci.com/gh/so-fancy/diff-so-fancy) [![TravisCI build](https://travis-ci.org/so-fancy/diff-so-fancy.svg?branch=master)](https://travis-ci.org/so-fancy/diff-so-fancy) [![AppVeyor build](https://ci.appveyor.com/api/projects/status/github/so-fancy/diff-so-fancy?branch=master&svg=true)](https://ci.appveyor.com/project/stevemao/diff-so-fancy/branch/master)
 
 `diff-so-fancy` strives to make your diff's **human** readable instead of machine readable. This helps improve code quality and help you spot defects faster.
 

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-# diff-so-fancy [![Circle CI build](https://circleci.com/gh/so-fancy/diff-so-fancy.svg?style=svg)](https://circleci.com/gh/so-fancy/diff-so-fancy) [![TravisCI build](https://travis-ci.org/so-fancy/diff-so-fancy.svg?branch=master)](https://travis-ci.org/so-fancy/diff-so-fancy) [![AppVeyor build](https://ci.appveyor.com/api/projects/status/github/so-fancy/diff-so-fancy?branch=master&svg=true)](https://ci.appveyor.com/project/stevemao/diff-so-fancy/branch/master)`
	`1`	`+# diff-so-fancy [![Circle CI build](https://circleci.com/gh/so-fancy/diff-so-fancy.svg?style=shield)](https://circleci.com/gh/so-fancy/diff-so-fancy) [![TravisCI build](https://travis-ci.org/so-fancy/diff-so-fancy.svg?branch=master)](https://travis-ci.org/so-fancy/diff-so-fancy) [![AppVeyor build](https://ci.appveyor.com/api/projects/status/github/so-fancy/diff-so-fancy?branch=master&svg=true)](https://ci.appveyor.com/project/stevemao/diff-so-fancy/branch/master)`
`2`	`2`
`3`	`3`	`diff-so-fancy` strives to make your diff's human readable instead of machine readable. This helps improve code quality and help you spot defects faster.
`4`	`4`