Move from coveralls -> codecov

Moving all repos to codecov

.travis.yml

@@ -14,7 +14,7 @@ script:
   - golangci-lint run ./...
   - rm -rf examples # Remove examples, no test coverage for them
   - go test -coverpkg=$(go list ./... | tr '\n' ',') -coverprofile=cover.out -v -race -covermode=atomic ./...
-  - goveralls -coverprofile=cover.out -service=travis-ci
+  - bash <(curl -s https://codecov.io/bash)
   - bash .github/assert-contributors.sh
   - bash .github/lint-disallowed-functions-in-library.sh
   - bash .github/lint-commit-message.sh

README.md

@@ -11,7 +11,7 @@
   <br>
   <a href="https://travis-ci.org/pion/dtls"><img src="https://travis-ci.org/pion/dtls.svg?branch=master" alt="Build Status"></a>
   <a href="https://godoc.org/github.com/pion/dtls"><img src="https://godoc.org/github.com/pion/dtls?status.svg" alt="GoDoc"></a>
-  <a href="https://coveralls.io/github/pion/dtls"><img src="https://coveralls.io/repos/github/pion/dtls/badge.svg" alt="Coverage Status"></a>
+  <a href="https://codecov.io/gh/pion/dtls"><img src="https://codecov.io/gh/pion/dtls/branch/master/graph/badge.svg" alt="Coverage Status"></a>
   <a href="https://goreportcard.com/report/github.com/pion/dtls"><img src="https://goreportcard.com/badge/github.com/pion/dtls" alt="Go Report Card"></a>
   <a href="https://www.codacy.com/app/Sean-Der/dtls"><img src="https://api.codacy.com/project/badge/Grade/18f4aec384894e6aac0b94effe51961d" alt="Codacy Badge"></a>
   <a href="LICENSE"><img src="https://img.shields.io/badge/License-MIT-yellow.svg" alt="License: MIT"></a>