make ClientHandle api return Send

[ariwaranosai]

api of clientHandle should return Send, since lookup and send all return Send.

[bluejekyll]

Thank you! I must have missed this in my changes.

[codecov]

Codecov Report

Merging #465 into master will decrease coverage by 0.08%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #465      +/-   ##
==========================================
- Coverage   86.59%   86.51%   -0.09%     
==========================================
  Files         133      133              
  Lines       13428    13428              
==========================================
- Hits        11628    11617      -11     
- Misses       1800     1811      +11

Impacted Files	Coverage Δ
client/src/client/client_future.rs	98.91% <100%> (ø)	⬆️
resolver/src/name_server_pool.rs	84.43% <0%> (-1.89%)	⬇️
proto/src/udp/udp_stream.rs	91.33% <0%> (-1.58%)	⬇️
proto/src/xfer/dns_future.rs	79.7% <0%> (-0.5%)	⬇️

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[bluejekyll]

Thanks again for this patch!

[ariwaranosai]

You’re welcome. I'm looking forward to release with tokio.

[bluejekyll]

I've started working on putting that together... I need to go back and review the CHANGELOG entries. I'm hoping to have time to do this over the next few days.