Fix: typo due to find and replace migration renamed to m

Signed-off-by: Gnanakeethan Balasubramaniam <gnanakeethan@gmail.com>

migration/ddl.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package m
+package migration
 
 import (
 	"fmt"