use ImageBase.restrict

[johnnychen94]

Until now I realize that we never test ImageTransformation.restrict for more than 3 years given that it's not loaded at all.

julia> @time using ImageShow
# master: 1.113088 seconds (2.31 M allocations: 169.042 MiB, 5.48% gc time, 0.24% compilation time)
# PR:  1.177738 seconds (2.35 M allocations: 172.266 MiB, 4.79% gc time, 0.29% compilation time)

[codecov]

Codecov Report

Merging #38 (e83e600) into master (6b60ba0) will increase coverage by 0.77%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #38      +/-   ##
==========================================
+ Coverage   86.42%   87.20%   +0.77%     
==========================================
  Files           6        6              
  Lines         221      211      -10     
==========================================
- Hits          191      184       -7     
+ Misses         30       27       -3     

Impacted Files	Coverage Δ
src/ImageShow.jl	0.00% <ø> (-40.00%)	⬇️
src/showmime.jl	97.18% <100.00%> (+1.07%)	⬆️

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