[fix] add range end and lease to txn

[Revolution1]

fix #77

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@245565a). Click here to learn what that means.
The diff coverage is 92%.

@@            Coverage Diff            @@
##             master      #89   +/-   ##
=========================================
  Coverage          ?   91.46%           
=========================================
  Files             ?       52           
  Lines             ?     2918           
  Branches          ?      302           
=========================================
  Hits              ?     2669           
  Misses            ?      145           
  Partials          ?      104

Impacted Files	Coverage Δ
etcd3/apis/watch.py	84% <ø> (ø)
etcd3/apis/auth.py	92.68% <ø> (ø)
etcd3/apis/lock.py	100% <ø> (ø)
etcd3/apis/kv.py	95.55% <ø> (ø)
etcd3/swagger_helper.py	79.21% <ø> (ø)
etcd3/baseclient.py	84% <ø> (ø)
etcd3/utils.py	86.27% <ø> (ø)
etcd3/models.py	100% <100%> (ø)
etcd3/stateful/lock.py	82.72% <100%> (ø)
tests/test_transaction_util.py	100% <100%> (ø)
... and 2 more

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