remove panic for fmt.Fprintf (bit prettier when printing to console)

cmd/golangci-lint/main.go

@@ -1,6 +1,9 @@
 package main
 
 import (
+	"fmt"
+	"os"
+
 	"github.com/golangci/golangci-lint/pkg/commands"
 )
 
@@ -13,7 +16,9 @@ var (
 
 func main() {
 	e := commands.NewExecutor(version, commit, date)
+
 	if err := e.Execute(); err != nil {
-		panic(err)
+		fmt.Fprintf(os.Stderr, "failed executing command with error %v\n", err)
+		os.Exit(1)
 	}
 }