fix linting (#4)

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

server/context.go

@@ -6,11 +6,13 @@ import (
 
 type serverKey struct{}
 
+// FromContext returns Server from context
 func FromContext(ctx context.Context) (Server, bool) {
 	c, ok := ctx.Value(serverKey{}).(Server)
 	return c, ok
 }
 
+// NewContext stores Server to context
 func NewContext(ctx context.Context, s Server) context.Context {
 	return context.WithValue(ctx, serverKey{}, s)
 }