Fix issues found by perfsprint linter

pkg/cfg/config.go

@@ -62,7 +62,7 @@ func Version() string {
 		return fmt.Sprintf("git-get %s (%s)", version, commit[:7])
 	}
 
-	return fmt.Sprintf("git-get %s", version)
+	return "git-get " + version
 }
 
 // Gitconfig represents gitconfig file.

pkg/git/repo.go

@@ -153,7 +153,7 @@ func (r *Repo) Branches() ([]string, error) {
 // Upstream returns the name of an upstream branch if a given branch is tracking one.
 // Otherwise it returns an empty string.
 func (r *Repo) Upstream(branch string) (string, error) {
-	out, err := run.Git("rev-parse", "--abbrev-ref", "--symbolic-full-name", fmt.Sprintf("%s@{upstream}", branch)).OnRepo(r.path).AndCaptureLine()
+	out, err := run.Git("rev-parse", "--abbrev-ref", "--symbolic-full-name", branch+"@{upstream}").OnRepo(r.path).AndCaptureLine()
 	if err != nil {
 		// TODO: no upstream will also throw an error.
 		// lint:ignore nilerr fix when working on TODO

pkg/git/repo_test.go

@@ -1,11 +1,11 @@
 package git
 
 import (
-	"fmt"
 	"git-get/pkg/git/test"
 	"os"
 	"path/filepath"
 	"reflect"
+	"strconv"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -339,7 +339,7 @@ func TestCleanupFailedClone(t *testing.T) {
 	}
 
 	for i, test := range tests {
-		t.Run(fmt.Sprintf("%d", i), func(t *testing.T) {
+		t.Run(strconv.Itoa(i), func(t *testing.T) {
 			root := createTestDirTree(t)
 
 			path := filepath.Join(root, test.path)

pkg/out/tree.go

@@ -20,7 +20,7 @@ func NewTreePrinter() *TreePrinter {
 // Print generates a tree view of repos and their statuses.
 func (p *TreePrinter) Print(root string, repos []Printable) string {
 	if len(repos) == 0 {
-		return fmt.Sprintf("There are no git repos under %s", root)
+		return "There are no git repos under " + root
 	}
 
 	tree := buildTree(root, repos)