add dev dependency badge
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		@@ -4,6 +4,7 @@ accepts call to execute in gulp pipeline.
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### build status/Dependencies
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[](https://travis-ci.org/pushrocks/gulp-callfunction)
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[](https://david-dm.org/pushrocks/gulp-callfunction)
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[](https://david-dm.org/pushrocks/gulp-callfunction#info=devDependencies)
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### Usage
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```javascript
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