bugfix: dup transfer target (#101)

* bugfix: dup transfer target

clean: go lint

fix: miss 'break' in alleviate shard

fix: targets gc

doc:correct typos (#87)

* doc update:orrect typos
Co-authored-by: wenmaoba <wenmaoba@tencent.com>

fix goreleaser (#84)

* release: v0.2.0

* doc: fix goreleaser

clea: remove some log

fix: unexpect scaling up when some targets is too big during shard al…

…leviation

fix: empty shard need ensure idle state every coordinate period

Merge branch 'master' of https://github.com/tkestack/kvass

# Conflicts:
#	examples/prometheus-rep-0.yaml