Colon-integer indexing bug

[max-vassili3v]

I noticed that the following doesn't work:

julia> b = BandedMatrix(Ones(3, 9), (0, 0))
3×9 BandedMatrix{Float64} with bandwidths (0, 0):
 1.0   ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅
  ⋅   1.0   ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅
  ⋅    ⋅   1.0   ⋅    ⋅    ⋅    ⋅    ⋅    ⋅

julia> b[:,6]
ERROR: BoundsError: attempt to access 3-element Vector{Float64} at index [1:5]
Stacktrace:
 [1] throw_boundserror(A::Vector{Float64}, I::Tuple{UnitRange{Int64}})
   @ Base .\abstractarray.jl:737
 [2] checkbounds
   @ .\abstractarray.jl:702 [inlined]
 [3] view
   @ .\subarray.jl:179 [inlined]
 [4] maybeview
   @ .\views.jl:148 [inlined]
 [5] dotview
   @ .\broadcast.jl:1244 [inlined]
 [6] getindex(A::BandedMatrix{Float64, Matrix{Float64}, Base.OneTo{Int64}}, ::Colon, j::Int64)
   @ BandedMatrices d:\Documents\Github\BandedMatrices.jl\src\banded\BandedMatrix.jl:423
 [7] top-level scope
   @ REPL[29]:1

I added a fix and updated the unit tests to cover it

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.84%. Comparing base (47c15ab) to head (67d5f3f).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #452      +/-   ##
==========================================
+ Coverage   89.61%   89.84%   +0.23%     
==========================================
  Files          25       25              
  Lines        3571     3643      +72     
==========================================
+ Hits         3200     3273      +73     
+ Misses        371      370       -1     

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[dlfivefifty]

Thanks!

[dlfivefifty]

PS It's a good idea to bump the version number (in this case a patch version, i.e. increase y in 1.x.y) as then I can just tag a new release right away with the fix