add alias for n gate

[GiggleLiu]

[codecov[bot]]

Codecov Report

Merging #176 (f85efea) into master (c9594a5) will increase coverage by 0.04%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #176      +/-   ##
==========================================
+ Coverage   81.23%   81.27%   +0.04%     
==========================================
  Files          46       46              
  Lines        2313     2313              
==========================================
+ Hits         1879     1880       +1     
+ Misses        434      433       -1     

Impacted Files	Coverage Δ
src/primitive/const_gate.jl	100.00% <ø> (ø)
src/treeutils/load.jl	83.60% <0.00%> (+0.81%)	:arrow_up:

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[GiggleLiu]

This PR should be merged to new Yao.