add support of dst structs with pointers

[propan]

Hi!

It would be great to support copying to structs that use pointers to the same types, e.g.:

type ChangedUser {
    Name *string
    Age *int
}

var request UpdateUserRequest
dst := &ChangedUser{}// a struct to copy to
mask, err := fieldmask_utils.MaskFromPaths(request.FieldMask.Paths, generator.CamelCase)
// handle err...
fieldmask_utils.StructToStruct(mask, request.User, dst)

Thanks!

[codecov[bot]]

Codecov Report

Merging #22 (aefe6e7) into master (45198b5) will increase coverage by 0.76%. The diff coverage is 92.59%.

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
+ Coverage   88.08%   88.85%   +0.76%     
==========================================
  Files           2        2              
  Lines         319      341      +22     
==========================================
+ Hits          281      303      +22     
  Misses         20       20              
  Partials       18       18              

Impacted Files	Coverage Δ
copy.go	85.20% <92.59%> (+1.61%)	:arrow_up:

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[mennanov]

Thanks!