fix lint errors.

Add test case for sending quit message when disconnecting.

Update changelog.

0.5.2

Merge pull request #487 from paladox/patch-1

Update iconv to 2.2.1 and node-icu-charset-detector to 0.2.0 to fix node 6+ support

Add versions 6 and 7 to travis.yml

Update changelog.

0.5.1

Merge pull request #385 from LinuxMercedes/message-split

Calculate maxLength correctly, respecting options

Add documentation for retryCount and retryDelay options.

Update changelog.

Get the actual hostname from a whois call

0.5.0