Set description max size to 512

Set description max size to 512 when creating a repository

Author: Crayon2000

repo.go

@@ -64,7 +64,7 @@ func (c *Client) ListOrgRepos(org string) ([]*Repository, error) {
 
 type CreateRepoOption struct {
 	Name        string `json:"name" binding:"Required;AlphaDashDot;MaxSize(100)"`
-	Description string `json:"description" binding:"MaxSize(255)"`
+	Description string `json:"description" binding:"MaxSize(512)"`
 	Private     bool   `json:"private"`
 	Unlisted    bool   `json:"unlisted"`
 	AutoInit    bool   `json:"auto_init"`