Move code into pkg directory (#22)

Makefile

@@ -1,6 +1,6 @@
 DC := docker-compose
 BUILD_FLAGS := -ldflags '-s'
-PACKAGES := . ./cmd/dbmate
+PACKAGES := ./cmd/... ./pkg/...
 
 all: clean container test lint build
 

cmd/dbmate/main.go

@@ -6,7 +6,7 @@ import (
 	"net/url"
 	"os"
 
-	"github.com/amacneil/dbmate"
+	"github.com/amacneil/dbmate/pkg/dbmate"
 	"github.com/joho/godotenv"
 	"github.com/urfave/cli"
 )

pkg/dbmate/db_test.go

@@ -16,7 +16,7 @@ func newTestDB(t *testing.T, u *url.URL) *DB {
 
 	// only chdir once, because testdata is relative to current directory
 	if testdataDir == "" {
-		testdataDir, err = filepath.Abs("./testdata")
+		testdataDir, err = filepath.Abs("../../testdata")
 		require.Nil(t, err)
 
 		err = os.Chdir(testdataDir)