Improve current_rocketchat_version(), wait for slow server startup #40
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There were occasions in the past where the Rocket.Chat server was not yet ready for the current version check, thus the script failed accordingly:
https://github.com/RocketChat/install.sh/blob/05b8d9b/rocketchatctl#L766
The new check will wait until the endpoint actually returns the version information as expected.
Fixes #34