Re: [monitoring-plugins/monitoring-plugins] Update .travis.yml (#1440)

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if travis does not like `[` then the line can be replaced with:

```
- test $(sudo ip addr show | grep "inet6 ::1" | wc -l) -lt "1" && sudo sed
-i '/^::1/d' /etc/hosts
```

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<p>if travis does not like <code>[</code> then the line can be replaced wit=
h:</p>

<pre><code>- test $(sudo ip addr show | grep "inet6 ::1" | wc -l) -lt "1" &=
amp;&amp; sudo sed -i '/^::1/d' /etc/hosts
</code></pre>

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