Remove obsolete Travis CI config

Also restore .mailmap, erroneously deleted in
commit bed854c

Change-Id: I086f83a46d5074024258d246b29dc232a79c74de

.mailmap

@@ -0,0 +1,5 @@
+Zhiyi Zhang <[email protected]> <[email protected]>
+<[email protected]> <[email protected]>
+Alexander Afanasyev <[email protected]> <[email protected]>
+Alexander Afanasyev <[email protected]> <[email protected]>
+Md Ashiqur Rahman <[email protected]>

AUTHORS.md

@@ -12,7 +12,7 @@ If you would like to become a contributor to the official repository, please fol
 * Md Ashiqur Rahman <https://ashiqrahman.com>
 * Junxiao Shi <https://cs.arizona.edu/~shijunxiao>
 * Yufeng Zhang <https://yufengzh.io>
-* ***(Maintainer)*** Zhiyi Zhang <https://zhiyi-zhang.com>
+* Zhiyi Zhang <https://zhiyi-zhang.com>
 
 # Technical Advisors
 

README.md

@@ -1,8 +1,7 @@
 # NDN Certificate Management Protocol (NDNCERT)
 
-![Language](https://img.shields.io/badge/C%2B%2B-14-blue.svg)
-[![Build Status](https://travis-ci.org/Zhiyi-Zhang/ndncert.svg?branch=v0.3)](https://travis-ci.org/Zhiyi-Zhang/ndncert)
-![build_v03](https://github.com/Zhiyi-Zhang/ndncert/workflows/build_v03/badge.svg)
+![build_v03](https://github.com/named-data/ndncert/workflows/build_v03/badge.svg)
+![Language](https://img.shields.io/badge/C%2B%2B-14-blue)
 
 The NDN certificate management protocol (**NDNCERT**) enables automatic certificate management
 in NDN. In Named Data Networking (NDN), every entity should have a corresponding identity