completely disable broken limit order for now, fix askmike#2398

exchange/orders/index.js

@@ -1,7 +1,5 @@
 const sticky = require('./sticky');
-const limit = require('./limit');
 
 module.exports = {
-  sticky,
-  limit
+  sticky
 }

exchange/orders/limit.js

@@ -1,3 +1,8 @@
+// NOTE: this is currently broken, see
+// @link https://github.com/askmike/gekko/issues/2398
+
+throw ':(';
+
 /*
   The limit order is a simple order:
     - It is created at the specified price