bugfix: fix ssim world age issue

[johnnychen94]

on master:

using ImageQualityIndexes
foo() = assess_ssim(rand(64, 64), rand(64, 64))
foo()

ERROR: MethodError: no method matching length(::ImageFiltering.KernelFactors.ReshapedOneD{Float64, 2, 0, OffsetArrays.OffsetVector{Float64, Vector{Float64}}})
The applicable method may be too new: running in world age 32409, while current world is 32421.
Closest candidates are:
  length(::ImageFiltering.KernelFactors.ReshapedOneD{T, N, Npre, V} where {T, N, Npre, V<:(AbstractVector)}) at ~/.julia/packages/ImageFiltering/cs86y/src/imfilter.jl:1558 (method too new to be called from this world context.)
  length(::Union{Base.KeySet, Base.ValueIterator}) at abstractdict.jl:58
  length(::Union{DataStructures.OrderedRobinDict, DataStructures.RobinDict}) at ~/.julia/packages/DataStructures/59MD0/src/ordered_robin_dict.jl:86 (method too new to be called from this world context.)
  ...
Stacktrace:
  [1] (::ImageQualityIndexes.var"#9#10")(w::ImageFiltering.KernelFactors.ReshapedOneD{Float64, 2, 0, OffsetArrays.OffsetVector{Float64, Vector{Float64}}}, a::Base.OneTo{Int64})
    @ ImageQualityIndexes ~/Documents/Julia/ImageQualityIndexes.jl/src/ssim.jl:176
  [2] map(f::ImageQualityIndexes.var"#9#10", t::Tuple{ImageFiltering.KernelFactors.ReshapedOneD{Float64, 2, 0, OffsetArrays.OffsetVector{Float64, Vector{Float64}}}, ImageFiltering.KernelFactors.ReshapedOneD{Float64, 2, 1, OffsetArrays.OffsetVector{Float64, Vector{Float64}}}}, s::Tuple{Base.OneTo{Int64}, Base.OneTo{Int64}})
    @ Base ./tuple.jl:247
  [3] _ssim_statistics(x::Matrix{Float64}, ref::Matrix{Float64}, window::OffsetArrays.OffsetVector{Float64, Vector{Float64}}; crop::Bool)
    @ ImageQualityIndexes ~/Documents/Julia/ImageQualityIndexes.jl/src/ssim.jl:175
  [4] __ssim_map_fast(x::Matrix{Float64}, ref::Matrix{Float64}, window::OffsetArrays.OffsetVector{Float64, Vector{Float64}}, C₁::Float64, C₂::Float64; crop::Bool)
    @ ImageQualityIndexes ~/Documents/Julia/ImageQualityIndexes.jl/src/ssim.jl:151
  [5] _ssim_map(iqi::SSIM{OffsetArrays.OffsetVector{Float64, Vector{Float64}}}, x::Matrix{Float64}, ref::Matrix{Float64}, peakval::Float64, K::Tuple{Float64, Float64})
    @ ImageQualityIndexes ~/Documents/Julia/ImageQualityIndexes.jl/src/ssim.jl:122
  [6] _ssim_map
    @ ~/Documents/Julia/ImageQualityIndexes.jl/src/ssim.jl:105 [inlined]
  [7] (::SSIM{OffsetArrays.OffsetVector{Float64, Vector{Float64}}})(x::Matrix{Float64}, ref::Matrix{Float64})
    @ ImageQualityIndexes ~/Documents/Julia/ImageQualityIndexes.jl/src/ssim.jl:85
  [8] #assess_ssim#5
    @ ~/Documents/Julia/ImageQualityIndexes.jl/src/ssim.jl:88 [inlined]
  [9] assess_ssim
    @ ~/Documents/Julia/ImageQualityIndexes.jl/src/ssim.jl:88 [inlined]
 [10] foo()
    @ Main ./REPL[2]:1
 [11] top-level scope
    @ REPL[3]:1

Will bump a new patch release for this ASAP

[codecov]

Codecov Report

Merging #52 (987d7c0) into master (13c73c3) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #52   +/-   ##
=======================================
  Coverage   96.70%   96.70%           
=======================================
  Files           7        7           
  Lines         182      182           
=======================================
  Hits          176      176           
  Misses          6        6           

Impacted Files	Coverage Δ
src/ssim.jl	100.00% <100.00%> (ø)

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