Add CI. Improve README. LICENSE fix typo.

.travis.yml

+os:
+  - linux
+
+language: go
+
+go:
+  - 1.14.x
+
+env:
+  global:
+    - GOTFLAGS="-race"
+  matrix:
+    - BUILD_DEPTYPE=gomod
+
+# disable travis install
+install:
+  - true
+
+script:
+  - bash <(curl -s https://raw.githubusercontent.com/ipfs/ci-helpers/master/travis-ci/run-standard-tests.sh)
+
+cache:
+  directories:
+    - $GOPATH/pkg/mod
+    - /home/travis/.cache/go-build
+
+notifications:
+  email: false

LICENSE

 The MIT License (MIT)
 
-Copyright (c) 2016 Protocol Labs, Inc.
+Copyright (c) 2020 Protocol Labs, Inc.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

 # go-libp2p-xor
 
+[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](https://protocol.ai)
+[![](https://img.shields.io/badge/project-libp2p-yellow.svg?style=flat-square)](https://libp2p.io)
+[![](https://img.shields.io/badge/freenode-%23libp2p-yellow.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23yellow)
+[![GoDoc](https://godoc.org/github.com/libp2p/go-libp2p-xor?status.svg)](https://godoc.org/github.com/libp2p/go-libp2p-xor)
+[![Build Status](https://travis-ci.org/libp2p/go-libp2p-xor.svg?branch=master)](https://travis-ci.org/libp2p/go-libp2p-xor)
+[![Discourse posts](https://img.shields.io/discourse/https/discuss.libp2p.io/posts.svg)](https://discuss.libp2p.io)
+
 > Implementation of XOR tries
 
 ## Summary
@@ -8,6 +15,12 @@ This package implements XOR tries.
 An XOR trie is a trie for equal-length bit strings.
 XOR tries support efficient set operations, as well as distance-based operations with respect to the XOR metric.
 
+## Contribute
+
+Contributions welcome. Please check out [the issues](https://github.com/libp2p/go-libp2p-xor/issues).
+
+Check out our [contributing document](https://github.com/libp2p/community/blob/master/CONTRIBUTE.md) for more information on how we work, and about contributing in general. Please be aware that all interactions related to libp2p are subject to the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).
+
 ## License
 
 [MIT](LICENSE) © Protocol Labs Inc.

go.mod

 module github.com/libp2p/go-libp2p-xor
 
-go 1.13
+go 1.14