resolve an ambiguity

[putianyi889]

similar(arr::CircularArray, ::Type{T}, dims::Tuple{Union{Integer, AbstractUnitRange}, Vararg{Union{Integer, AbstractUnitRange}}}) where T   
     @ CircularArrays C:\Users\pty\.julia\packages\CircularArrays\6Q9fC\src\CircularArrays.jl:71
similar(a::AbstractArray, ::Type{T}, dims::Tuple{Integer, Vararg{Integer}}) where T
     @ Base abstractarray.jl:837

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ec93323) 100.00% compared to head (d6510ae) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #31   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           50        51    +1     
=========================================
+ Hits            50        51    +1     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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