Update dependencies and vendor (#1761)

vendor/github.com/labstack/echo/v4/context.go

@@ -9,8 +9,6 @@ import (
 	"net"
 	"net/http"
 	"net/url"
-	"os"
-	"path/filepath"
 	"strings"
 	"sync"
 )
@@ -210,6 +208,13 @@ type (
 	}
 )
 
+const (
+	// ContextKeyHeaderAllow is set by Router for getting value for `Allow` header in later stages of handler call chain.
+	// Allow header is mandatory for status 405 (method not found) and useful for OPTIONS method requests.
+	// It is added to context only when Router does not find matching method handler for request.
+	ContextKeyHeaderAllow = "echo_header_allow"
+)
+
 const (
 	defaultMemory = 32 << 20 // 32 MB
 	indexPage     = "index.html"
@@ -562,29 +567,6 @@ func (c *context) Stream(code int, contentType string, r io.Reader) (err error)
 	return
 }
 
-func (c *context) File(file string) (err error) {
-	f, err := os.Open(file)
-	if err != nil {
-		return NotFoundHandler(c)
-	}
-	defer f.Close()
-
-	fi, _ := f.Stat()
-	if fi.IsDir() {
-		file = filepath.Join(file, indexPage)
-		f, err = os.Open(file)
-		if err != nil {
-			return NotFoundHandler(c)
-		}
-		defer f.Close()
-		if fi, err = f.Stat(); err != nil {
-			return
-		}
-	}
-	http.ServeContent(c.Response(), c.Request(), fi.Name(), fi.ModTime(), f)
-	return
-}
-
 func (c *context) Attachment(file, name string) error {
 	return c.contentDisposition(file, name, "attachment")
 }