Fix build status url in README

Signed-off-by: Hoai-Thu Vuong <thuvh87@gmail.com>

Author: thuvh

README.md

@@ -29,4 +29,4 @@ to use one's personal email address in the contact details, rather than an
 @work address. Your Full name will be public. The email address and other contact details are
 not published.
 
-[![Build Status](https://travis-ci.com/trinodb/cla.svg?branch=master)](https://travis-ci.com/trinodb/cla)
+[![Build Status](https://api.travis-ci.com/trinodb/cla.svg?branch=master)](https://travis-ci.com/trinodb/cla)