Revert badge to the SymbiFlow Travis-CI.

Signed-off-by: Keith Rothman <[email protected]>

Updated README.md

Signed-off-by: Alessandro Comodi <[email protected]>

Author: litghost

README.md

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+SymbiFlow WIP changes for Verilog to Routing (VTR)
+==================================================
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+This branch contains work in progress changes for using Verilog to Routing
+(VTR) as part of SymbiFlow.
+
+---
+
 # Verilog to Routing (VTR)
-[![Build Status](https://travis-ci.org/verilog-to-routing/vtr-verilog-to-routing.svg?branch=master)](https://travis-ci.org/verilog-to-routing/vtr-verilog-to-routing) [![Documentation Status](https://readthedocs.org/projects/vtr/badge/?version=latest)](http://docs.verilogtorouting.org/en/latest/?badge=latest)
+[![Build Status](https://travis-ci.com/SymbiFlow/vtr-verilog-to-routing.svg?branch=master)](https://travis-ci.com/SymbiFlow/vtr-verilog-to-routing) [![Documentation Status](https://readthedocs.org/projects/vtr/badge/?version=latest)](http://docs.verilogtorouting.org/en/latest/?badge=latest)
 
 ## Introduction
 The Verilog-to-Routing (VTR) project is a world-wide collaborative effort to provide a open-source framework for conducting FPGA architecture and CAD research and development.