Add Travis badge to Readme

README.md

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+[![Build Status][BS IMG]](https://travis-ci.org/saveriomiroddi/zfs-installer)
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 # zfs-installer
 
 ZFS installer is shell script program that fully prepares ZFS on a system, and allows an effortless installation of Ubuntu via the standard installer (or via any script).
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 Many thanks to Gerard Beekmans for reaching out and giving useful feedback and help.
 
 As my other open source work and [technical writing](https://saveriomiroddi.github.io), this project is sponsored by [Ticketsolve](https://ticketsolve.com).
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+[BS img]: https://travis-ci.org/saveriomiroddi/zfs-installer.svg?branch=master