Update vendored tools/.

tools/vendor/github.com/mattn/goveralls/goveralls.go

@@ -6,6 +6,7 @@
 package main
 
 import (
+	"bytes"
 	_ "crypto/sha512"
 	"encoding/json"
 	"errors"
@@ -43,7 +44,7 @@ func (a *Flags) Set(value string) error {
 var (
 	extraFlags Flags
 	pkg        = flag.String("package", "", "Go package")
-	verbose    = flag.Bool("v", false, "Pass '-v' argument to 'go test'")
+	verbose    = flag.Bool("v", false, "Pass '-v' argument to 'go test' and output to stdout")
 	debug      = flag.Bool("debug", false, "Enable debug output")
 	coverprof  = flag.String("coverprofile", "", "If supplied, use a go cover profile (comma separated)")
 	covermode  = flag.String("covermode", "count", "sent as covermode argument to go test")
@@ -127,19 +128,25 @@ func getCoverage() ([]*SourceFile, error) {
 			return nil, err
 		}
 		f.Close()
-
 		cmd := exec.Command("go")
+		outBuf := new(bytes.Buffer)
+		cmd.Stdout = outBuf
+		cmd.Stderr = outBuf
+
 		args := []string{"go", "test", "-covermode", *covermode, "-coverprofile", f.Name(), coverpkg}
 		if *verbose {
 			args = append(args, "-v")
+			cmd.Stdout = os.Stdout
 		}
 		args = append(args, extraFlags...)
 		args = append(args, line)
 		cmd.Args = args
-		b, err := cmd.CombinedOutput()
+
+		err = cmd.Run()
 		if err != nil {
-			return nil, fmt.Errorf("%v: %v", err, string(b))
+			return nil, fmt.Errorf("%v: %v", err, outBuf.String())
 		}
+
 		pfs, err := cover.ParseProfiles(f.Name())
 		if err != nil {
 			return nil, err