Diag for OneElement returns a OneElement

[jishnub]

After this,

julia> O = OneElement(4, (3,1), (4,6))
4×6 OneElement{Int64, 2, Tuple{Int64, Int64}, Tuple{Base.OneTo{Int64}, Base.OneTo{Int64}}}:
 ⋅  ⋅  ⋅  ⋅  ⋅  ⋅
 ⋅  ⋅  ⋅  ⋅  ⋅  ⋅
 4  ⋅  ⋅  ⋅  ⋅  ⋅
 ⋅  ⋅  ⋅  ⋅  ⋅  ⋅

julia> diag(O)
4-element OneElement{Int64, 1, Tuple{Int64}, Tuple{Base.OneTo{Int64}}}:
 ⋅
 ⋅
 ⋅
 ⋅

julia> diag(O,-2)
2-element OneElement{Int64, 1, Tuple{Int64}, Tuple{Base.OneTo{Int64}}}:
 4
 ⋅

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.91%. Comparing base (9868632) to head (6bd1305).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #383   +/-   ##
=======================================
  Coverage   99.90%   99.91%           
=======================================
  Files           8        8           
  Lines        1110     1115    +5     
=======================================
+ Hits         1109     1114    +5     
  Misses          1        1           

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