Fix Workplane.close bug with 3D points

[lorenzncode]

Resolves #1253

[codecov]

Codecov Report

Merging #1271 (24c2496) into master (2997a3a) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1271      +/-   ##
==========================================
+ Coverage   94.09%   94.11%   +0.02%     
==========================================
  Files          26       26              
  Lines        5433     5435       +2     
  Branches      920      921       +1     
==========================================
+ Hits         5112     5115       +3     
+ Misses        190      189       -1     
  Partials      131      131              

Impacted Files	Coverage Δ
cadquery/cq.py	92.19% <100.00%> (ø)
cadquery/occ_impl/shapes.py	92.75% <0.00%> (+0.09%)	⬆️

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[adam-urbanczyk]

LGTM

[jmwright]

Thanks @lorenzncode