make osmpbf protobuf package internal

parser/pbf/lowlevel.go

@@ -12,7 +12,7 @@ import (
 	"time"
 
 	"github.com/golang/protobuf/proto"
-	"github.com/omniscale/imposm3/parser/pbf/osmpbf"
+	"github.com/omniscale/imposm3/parser/pbf/internal/osmpbf"
 )
 
 type block struct {

parser/pbf/pbf.go

@@ -2,7 +2,7 @@ package pbf
 
 import (
 	"github.com/omniscale/imposm3/element"
-	"github.com/omniscale/imposm3/parser/pbf/osmpbf"
+	"github.com/omniscale/imposm3/parser/pbf/internal/osmpbf"
 )
 
 const coord_factor float64 = 11930464.7083 // ((2<<31)-1)/360.0

parser/pbf/pbf_test.go

@@ -9,7 +9,7 @@ import (
 	"testing"
 
 	"github.com/golang/protobuf/proto"
-	"github.com/omniscale/imposm3/parser/pbf/osmpbf"
+	"github.com/omniscale/imposm3/parser/pbf/internal/osmpbf"
 )
 
 func BenchmarkHello(b *testing.B) {