https://github.com/labstack/echo/pull/628, https://github.com/labstack/echo/issues/616

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

log/color.go

@@ -0,0 +1,13 @@
+// +build !appengine
+
+package log
+
+import (
+	"io"
+
+	"github.com/mattn/go-colorable"
+)
+
+func output() io.Writer {
+	return colorable.NewColorableStdout()
+}

log/white.go

@@ -0,0 +1,9 @@
+// +build appengine
+
+package log
+
+import "io"
+
+func output() io.Writer {
+	return os.stdout
+}