CI: verify builds

Author: DeviaVir

README.md

@@ -1,5 +1,7 @@
 # Esplora Block Explorer
 
+test
+
 [![build status](https://api.travis-ci.org/Blockstream/esplora.svg)](https://travis-ci.org/Blockstream/esplora)
 [![docker release](https://img.shields.io/docker/pulls/blockstream/esplora.svg)](https://hub.docker.com/r/blockstream/esplora)
 [![MIT license](https://img.shields.io/github/license/blockstream/esplora.svg)](https://github.com/blockstream/esplora/blob/master/LICENSE)