panic when GetMethod on interface{}

[Sychorius]

Describe the bug

panic when GetMethod on interface{} with message: reflect: call of reflect.Value.Interface on zero Value

To Reproduce

run this test

type A interface {
	Foo()
}

type a struct {
	A
}

type b struct {
	i int
}

func (*b) Foo() {
	fmt.Println("abc")
}

func NewA() A {
	return &a{A: new(b)}
}

func TestXxx(t *testing.T) {
	mockey.PatchConvey("sample", t, func() {
		obj := NewA()
		mockey.Mock(mockey.GetMethod(obj, "Foo")).Build()
	})
}

Expected behavior

Not panic, mock successfully

Mockey version:

v1.2.0

[Sychorius]

This is because getNestedMethod use reflect.Type not reflect.Value, which loss the interface{} field context.
We will fix it soon