Add nil and replace null with it

[Flipez]

Signed-off-by: Flipez code@brauser.io

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Name	Status	Preview	Updated
rocket-lang	✅ Ready (Inspect)	Visit Preview	Jul 3, 2022 at 10:53AM (UTC)

[codecov]

Codecov Report

Merging #91 (f197d1a) into main (fc571f4) will increase coverage by 0.03%.
The diff coverage is 96.87%.

@@            Coverage Diff             @@
##             main      #91      +/-   ##
==========================================
+ Coverage   85.81%   85.85%   +0.03%     
==========================================
  Files          96       98       +2     
  Lines        2975     3004      +29     
==========================================
+ Hits         2553     2579      +26     
- Misses        360      362       +2     
- Partials       62       63       +1     

Impacted Files	Coverage Δ
object/file.go	47.79% <ø> (ø)
token/token.go	88.00% <ø> (ø)
object/http.go	85.80% <50.00%> (ø)
evaluator/evaluator.go	78.88% <66.66%> (+0.23%)	⬆️
ast/nil.go	100.00% <100.00%> (ø)
evaluator/if.go	100.00% <100.00%> (ø)
evaluator/import.go	100.00% <100.00%> (ø)
evaluator/index.go	100.00% <100.00%> (ø)
evaluator/ternary.go	100.00% <100.00%> (ø)
evaluator/while.go	100.00% <100.00%> (ø)
... and 10 more

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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