Import os to fix issue in previous merge commit.

7c7d477d · Abubakr-Sadik Nii Nai Davis · dddea287 · 7c7d477d
Commit 7c7d477d authored 7 years ago by Abubakr-Sadik Nii Nai Davis
--- a/check/check.go
+++ b/check/check.go
@@ -18,6 +18,7 @@ import (
 	"bytes"
 	"fmt"
 	"io"
+	"os"
 	"os/exec"
 	"regexp"
 	"strings"