Nudge v0.3.0

This version brings Nudge to Beta level. Configuration file is stabilized for now, and inner workings are polished. Some half baked parts are removed.

What’s New
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- Logging related options are removed from the configuration file, since Zap library doesn't support dynamic reconfiguration except logging level.

Known Issues
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- Not all features provided by Pushover is supported yet.

Next Plans
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- Starting to add missing Pushover features.