Fixed #995

Signed-off-by: Vishal Rana <vr@labstack.com>

echo.go

@@ -295,7 +295,7 @@ func New() (e *Echo) {
 func (e *Echo) NewContext(r *http.Request, w http.ResponseWriter) Context {
 	return &context{
 		request:  r,
-		response: &Response{echo: e, Writer: w},
+		response: NewResponse(w, e),
 		store:    make(Map),
 		echo:     e,
 		pvalues:  make([]string, *e.maxParam),

response.go

@@ -20,6 +20,11 @@ type (
 	}
 )
 
+// NewResponse creates a new instance of Response.
+func NewResponse(w http.ResponseWriter, e *Echo) (r *Response) {
+	return &Response{Writer: w, echo: e}
+}
+
 // Header returns the header map for the writer that will be sent by
 // WriteHeader. Changing the header after a call to WriteHeader (or Write) has
 // no effect unless the modified headers were declared as trailers by setting