Add under development warning

odow · odow · commit e8c752420577 · 2019-04-04T16:00:58.000-05:00
diff --git a/README.md b/README.md
@@ -1,5 +1,7 @@
 # MathOptFormat
 
+_WARNING: this file format is under active development. Things may change!_
+
 This repository describes a file-format for mathematical optimization problems
 called _MathOptFormat_ with the file extension `.mof.json`.
 
