object/integer: satisfy iterable interface

[RaphaelPour]

Make integer iterable to provide an easy way of iterating from 0 to an arbitrary number.

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[codecov]

Codecov Report

Merging #66 (bee6c50) into master (6662628) will increase coverage by 0.90%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
+ Coverage   82.01%   82.91%   +0.90%     
==========================================
  Files          81       81              
  Lines        2319     2336      +17     
==========================================
+ Hits         1902     1937      +35     
+ Misses        354      339      -15     
+ Partials       63       60       -3     

Impacted Files	Coverage Δ
object/integer.go	100.00% <100.00%> (ø)
parser/foreach.go	67.44% <100.00%> (+7.44%)	⬆️
parser/expression.go	80.00% <0.00%> (+8.88%)	⬆️
parser/parser.go	98.91% <0.00%> (+11.95%)	⬆️
parser/hash.go	73.91% <0.00%> (+13.04%)	⬆️

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