Fix overflow for empty ranges

[jishnub]

Fixes #225 partially (overflow is not allowed in the OffsetArray constructor for now).

Now

julia> OffsetArray(1:0, typemax(Int))
ERROR: OverflowError: offset should be <= 9223372036854775806 corresponding to the axis Base.OneTo(0), received an offset 9223372036854775807

[codecov]

Codecov Report

Merging #226 (77988ea) into master (ac9821e) will increase coverage by 0.70%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #226      +/-   ##
==========================================
+ Coverage   98.33%   99.04%   +0.70%     
==========================================
  Files           5        5              
  Lines         301      314      +13     
==========================================
+ Hits          296      311      +15     
+ Misses          5        3       -2     

Impacted Files	Coverage Δ
src/OffsetArrays.jl	98.59% <100.00%> (+0.59%)	⬆️
src/precompile.jl	100.00% <0.00%> (+7.14%)	⬆️

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[johnnychen94]

Thank you @jishnub for your consistent improvement to this package, you really are bug hunters!