Merge pull request #671 from sabre-io/DeepDiver1975-patch-1

docs: Remove outdated build status in README.md

Author: DeepDiver1975

README.md

@@ -27,21 +27,6 @@ Usage
 * [Working with iCalendar](http://sabre.io/vobject/icalendar/)
 
 
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-Build status
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-| branch | status |
-| ------ | ------ |
-| master | [![Build Status](https://travis-ci.org/sabre-io/vobject.svg?branch=master)](https://travis-ci.org/sabre-io/vobject) |
-| 3.5    | [![Build Status](https://travis-ci.org/sabre-io/vobject.svg?branch=3.5)](https://travis-ci.org/sabre-io/vobject) |
-| 3.4    | [![Build Status](https://travis-ci.org/sabre-io/vobject.svg?branch=3.4)](https://travis-ci.org/sabre-io/vobject) |
-| 3.1    | [![Build Status](https://travis-ci.org/sabre-io/vobject.svg?branch=3.1)](https://travis-ci.org/sabre-io/vobject) |
-| 2.1    | [![Build Status](https://travis-ci.org/sabre-io/vobject.svg?branch=2.1)](https://travis-ci.org/sabre-io/vobject) |
-| 2.0    | [![Build Status](https://travis-ci.org/sabre-io/vobject.svg?branch=2.0)](https://travis-ci.org/sabre-io/vobject) |
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 Support
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