fix: special slice types cause panic when reflectively generating values

[rgaskill]

The updated faker test will product the following without the convert update for slices.

panic: reflect.Set: value of type int32 is not assignable to type faker.SomeInt32 [recovered]
        panic: reflect.Set: value of type int32 is not assignable to type faker.SomeInt32

goroutine 34 [running]:
testing.tRunner.func1.1(0x1162b20, 0xc00017f960)
        /usr/local/Cellar/go/1.14/libexec/src/testing/testing.go:941 +0x3d0
testing.tRunner.func1(0xc000166240)
        /usr/local/Cellar/go/1.14/libexec/src/testing/testing.go:944 +0x3f9
panic(0x1162b20, 0xc00017f960)
        /usr/local/Cellar/go/1.14/libexec/src/runtime/panic.go:967 +0x15d
reflect.Value.assignTo(0x11622e0, 0xc00018402c, 0x85, 0x11a5a9a, 0xb, 0x1162220, 0x0, 0x33, 0xc000186000, 0x17)
        /usr/local/Cellar/go/1.14/libexec/src/reflect/value.go:2403 +0x426
reflect.Value.Set(0x1162220, 0xc000186000, 0x185, 0x11622e0, 0xc00018402c, 0x85)
        /usr/local/Cellar/go/1.14/libexec/src/reflect/value.go:1532 +0xbd
github.com/bxcodec/faker/v3.getValue(0x115f740, 0xc00000f820, 0x197, 0x1, 0x115f740, 0xc00000f820, 0x197)
        /Users/roarkegaskill/Developer/faker/faker.go:451 +0xd67
github.com/bxcodec/faker/v3.getValue(0x119c840, 0xc000128780, 0x199, 0x119c801, 0x119c840, 0xc000128780, 0x320)
        /Users/roarkegaskill/Developer/faker/faker.go:396 +0x22e1
github.com/bxcodec/faker/v3.getValue(0x116c9a0, 0xc000128280, 0x0, 0xc00005c980, 0x100c686, 0xc000128280, 0x280)
        /Users/roarkegaskill/Developer/faker/faker.go:355 +0x169e
github.com/bxcodec/faker/v3.FakeData(0x116c9a0, 0xc000128280, 0x11, 0xc00005ca70)
        /Users/roarkegaskill/Developer/faker/faker.go:280 +0x1c6
github.com/bxcodec/faker/v3.TestFakerData(0xc000166240)
        /Users/roarkegaskill/Developer/faker/faker_test.go:277 +0x5c
testing.tRunner(0xc000166240, 0x11b2650)
        /usr/local/Cellar/go/1.14/libexec/src/testing/testing.go:992 +0xdc
created by testing.(*T).Run
        /usr/local/Cellar/go/1.14/libexec/src/testing/testing.go:1043 +0x357
FAIL    github.com/bxcodec/faker/v3     0.148s
?       github.com/bxcodec/faker/v3/support/slice       [no test files]
FAIL

[codecov]

Codecov Report

Merging #91 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
+ Coverage   94.92%   94.92%   +<.01%     
==========================================
  Files          10       10              
  Lines         965      966       +1     
==========================================
+ Hits          916      917       +1     
  Misses         27       27              
  Partials       22       22

Impacted Files	Coverage Δ
faker.go	90.37% <100%> (+0.02%)	⬆️

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[bxcodec]

LGTM.

Thanks for the PR sir @rgaskill