Get implemented on T instead of *T

Methods defined on T are also available on *T. Thought this technically
changes the interface, because *T will be automatically dereferenced as
needed it shouldn't be a breaking change.

See a8802b16cc for similar change.

ext/gofrs-uuid/uuid.go

@@ -47,7 +47,7 @@ func (dst *UUID) Set(src interface{}) error {
 	return nil
 }
 
-func (dst *UUID) Get() interface{} {
+func (dst UUID) Get() interface{} {
 	switch dst.Status {
 	case pgtype.Present:
 		return dst.UUID

ext/shopspring-numeric/decimal.go

@@ -89,7 +89,7 @@ func (dst *Numeric) Set(src interface{}) error {
 	return nil
 }
 
-func (dst *Numeric) Get() interface{} {
+func (dst Numeric) Get() interface{} {
 	switch dst.Status {
 	case pgtype.Present:
 		return dst.Decimal