Sync build system and CI scripts with ndn-cxx

 * Update build flags
 * Update waf to version 2.0.21
 * Replace Travis CI with GitHub Actions

Change-Id: If45c45c7b9ed748ffd1c4e792075f6bb6f09462f
diff --git a/README.md b/README.md
index 7c87b4c..fe3247f 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # NDN Traffic Generator
 
-![Language](https://img.shields.io/badge/C%2B%2B-14-blue.svg)
-[![Build Status](https://travis-ci.org/named-data/ndn-traffic-generator.svg?branch=master)](https://travis-ci.org/named-data/ndn-traffic-generator)
+[![CI](https://github.com/named-data/ndn-traffic-generator/actions/workflows/ci.yml/badge.svg)](https://github.com/named-data/ndn-traffic-generator/actions/workflows/ci.yml)
+![Language](https://img.shields.io/badge/C%2B%2B-14-blue)
 
 This tool is designed to generate Interest and Data traffic in an NDN network.
 The client and server tool accept traffic configuration files which can be