Calling isServerReady on ready-endpoint

[hgranlund]

A solution to Issue-31

[coveralls]

Pull Request Test Coverage Report for Build 135

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 91.327%

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Totals
Change from base Build 133:	0.0%
Covered Lines:	139
Relevant Lines:	148

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💛 - Coveralls

[gajus]

:tada: This PR is included in version 6.6.1 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: