message: update travis url
diff: <div align="center">
  <br />
  <br />
  - <a href="https://travis-ci.org/JoviDeCroock/urql-preact">
  - <img alt="Test Status" src="https://api.travis-ci.org/JoviDeCroock/urql-preact.svg?branch=master" />
  + <a href="https://travis-ci.org/JoviDeCroock/preact-urql">
  + <img alt="Test Status" src="https://api.travis-ci.org/JoviDeCroock/preact-urql.svg?branch=master" />
  </a>
  <a href="https://codecov.io/gh/JoviDeCroock/preact-urql">
  <img alt="Test Coverage" src="https://codecov.io/gh/JoviDeCroock/preact-urql/branch/master/graph/badge.svg" />
  