Fixes wrapped types definition

[cuva]

Previously providing a field of type [Int] would define a GraphQL type [Int!] instead of defining [Int!]!. In order to define a [Int!] GraphQL type, one should now provide [Int]?.

The following cases are now properly handled:

Swift Type	GraphQL Type
[Int]	[Int!]!
[Int?]	[Int]!
[Int]?	[Int!]
[Int?]?	[Int]

Simplifies getGraphQLType(from:) to always recurse at least once given a wrapped type to avoid duplicate logic.

[codecov-io]

Codecov Report

Merging #7 into master will increase coverage by 1.37%.
The diff coverage is 96%.

@@            Coverage Diff             @@
##           master       #7      +/-   ##
==========================================
+ Coverage   81.31%   82.69%   +1.37%     
==========================================
  Files          13       13              
  Lines        1686     1745      +59     
==========================================
+ Hits         1371     1443      +72     
+ Misses        315      302      -13

Impacted Files	Coverage Δ
...s/GraphitiTests/StarWarsTests/StarWarsSchema.swift	80% <ø> (ø)	⬆️
...sts/StarWarsTests/StarWarsIntrospectionTests.swift	97.55% <100%> (ø)	⬆️
Sources/Graphiti/Schema/Schema.swift	57.34% <94.73%> (+10.72%)	⬆️

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[paulofaria]

thanks a lot (:

[paulofaria]

merged and tagged