FlushLatest option for ChannelBatchConfig

[FZambia]

Should be handy to reduce size of data sent in streams with entire state in publications. Where intermediary message loss is safe and beneficial.

type ChannelBatchConfig struct {
	// MaxSize is the maximum number of messages to batch before flushing.
	MaxSize int64
	// MaxDelay is the maximum time to wait before flushing.
	MaxDelay time.Duration
	// FlushLatest if true, then Centrifuge flushes only the latest item in the batch
	// upon reaching the MaxSize or MaxDelay.
	FlushLatest bool // <- THIS ONE!
}

[codecov]

Codecov Report

Attention: Patch coverage is 95.83333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 83.22%. Comparing base (0bf59d4) to head (c838e66).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
client.go	91.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #471      +/-   ##
==========================================
- Coverage   83.58%   83.22%   -0.37%     
==========================================
  Files          39       39              
  Lines        8956     8948       -8     
==========================================
- Hits         7486     7447      -39     
- Misses       1112     1139      +27     
- Partials      358      362       +4     

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