fix golint errors

auth.go

@@ -6,7 +6,7 @@ import (
 	"github.com/partitio/gonextcloud/types"
 )
 
-var unauthorized = fmt.Errorf("login first")
+var errUnauthorized = fmt.Errorf("login first")
 
 // Login perform login and create a session with the Nextcloud API.
 func (c *Client) Login(username string, password string) error {

routes.go

@@ -2,7 +2,7 @@ package gonextcloud
 
 import "net/url"
 
-// Route references the available routes
+// Routes references the available routes
 type Routes struct {
 	capabilities *url.URL
 	users        *url.URL

users.go

@@ -220,7 +220,7 @@ func (c *Client) UserGroupDemote(name string, group string) error {
 //UserGroupSubAdminList lists the groups where he is subadmin
 func (c *Client) UserGroupSubAdminList(name string) ([]string, error) {
 	if !c.loggedIn() {
-		return nil, unauthorized
+		return nil, errUnauthorized
 	}
 	u := c.baseURL.ResolveReference(routes.users)
 	u.Path = path.Join(u.Path, name, "subadmins")

utils.go

@@ -12,7 +12,7 @@ import (
 
 func (c *Client) baseRequest(route *url.URL, name string, subroute string, ro *req.RequestOptions, method string) (*req.Response, error) {
 	if !c.loggedIn() {
-		return nil, unauthorized
+		return nil, errUnauthorized
 	}
 	u := c.baseURL.ResolveReference(route)
 	if name != "" {