Goodbye Greenkeeper 👋 (#2)

Co-authored-by: greenkeeper[bot] <23040076+greenkeeper[bot]@users.noreply.github.com>

Author: greenkeeper[bot]

README.md

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 [![Build Status](https://travis-ci.org/AlaSQL/alasql-docs.svg?branch=master)](https://travis-ci.org/AlaSQL/alasql-docs)
-[![Greenkeeper badge](https://badges.greenkeeper.io/AlaSQL/alasql-docs.svg)](https://greenkeeper.io/)
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 # AlaSQL documentation