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I don't think small fix like this doesn't require CLA sign.
But please wait for confirm from other core dev.

I'm sorry. CLA is required.
#19 (comment)

Codecov Report

Merging#20 intomaster willdecrease coverage by-0.01%.

@@            Coverage Diff             @@##           master      #20      +/-   ##==========================================- Coverage   82.37%   82.37%   -0.01%==========================================  Files        1427     1427                Lines      350948   350948              ==========================================- Hits       289091   289089       -2- Misses      61857    61859       +2

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Why is this change tagged with "backport to 3.6"? Was it made in the 3.6 branch? If yes, I suggest to only modify master.

Broken links, typo fixes, comment updates etc. usually go to all maintenance branches.'backport to X.Y' label means this needs to be backported to X.Y branch.

I have completed the above steps.

Thanks, friends!

Don't forget to update Python 2.7 as well.