travis - status image and link

Author: plainlystated

README.md

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 # TempoDB (Embedded) C Client
 
+[![Build Status](https://travis-ci.org/tempodb/tempodb-embedded-c.png)](https://travis-ci.org/tempodb/tempodb-embedded-c)
+
 The [TempoDB](http://www.tempo-db.com) (Embedded) C API Client is intended for use with embedded electronics. It is designed to be lightweight and portable, and to address a variety of platforms. In the interest of targeting smaller devices, it provides a write-only subset of the API features you'd get from one of [our higher-level libraries](http://tempo-db.com/docs/clients/).
 
 ## Beta