fix(readme): fix travis url

Itee · Itee · commit 1ff3cbea5d0e · 2019-08-03T02:57:14.000+02:00
diff --git a/README.md b/README.md
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+[![Build Status](https://travis-ci.org/Itee/itee-database.svg?branch=master)](https://travis-ci.org/Itee/itee-database)
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 # <center>[Itee Database]</center>
 
 The itee database contain all abstract class to manage database middleware and database plugins for itee server.
