fix(pkg/db): create or upgrade postgres schema based on semver

main.go

@@ -5,10 +5,14 @@ import (
 	"os"
 	"os/user"
 
+	"github.com/Masterminds/semver"
+
 	"github.com/go-flucky/flucky/cmd"
 )
 
-var version string
+var (
+	version string
+)
 
 func main() {
 
@@ -23,5 +27,11 @@ func main() {
 		os.Exit(1)
 	}
 
+	sversion, err := semver.NewVersion(version)
+	if err != nil {
+		log.Println("The sematic versioning is invalid: %v", version)
+		os.Exit(1)
+	}
+
 	cmd.Execute(version)
 }