feat: support context interface for Context

.gitignore

@@ -2,4 +2,5 @@ vendor
 tmp
 *.out
 examples/*/go.sum
-_book
+_book
+.vscode

context.go

@@ -103,6 +103,22 @@ const (
 	SignedCookieSuffix = ".sig"
 )
 
+func (c *Context) Deadline() (deadline time.Time, ok bool) {
+	return c.Context().Deadline()
+}
+
+func (c *Context) Done() <-chan struct{} {
+	return c.Context().Done()
+}
+
+func (c *Context) Err() error {
+	return c.Context().Err()
+}
+
+func (c *Context) Value(key interface{}) interface{} {
+	return c.Context().Value(key)
+}
+
 // Reset all fields of context
 func (c *Context) Reset() {
 	c.Request = nil

elton.go

@@ -126,6 +126,7 @@ type (
 )
 
 var _ http.Handler = (*Elton)(nil)
+var _ context.Context = (*Context)(nil)
 
 // DefaultSkipper default skipper function
 func DefaultSkipper(c *Context) bool {