added upgrade instructions

upgrade.md

@@ -0,0 +1,30 @@
+Prior to `1.0`, icrementing the second decimal place indicates a potential breaking change.
+
+**0.8.x to 0.9.x**
+
+- Stores are now singletons. The dispatcher's `getStores` method must go from...
+```javascript
+getStores: function ()
+  return{
+    myStore: MyStore()
+  }
+}
+```
+to...
+```javascript
+getStores: function ()
+  return{
+    myStore: MyStore
+  }
+}
+```
+where `MyStore` is the output of `Flux.createStore`
+
+- Scheme values are now set on a `store.state` object rather than directly on the store itself. If you are using `scheme`, and accessing and scheme properties directly within a store (rather than just through `this.set`), you will need to update your code to access the property from the `state` object...
+```javascript
+this.mySchemeProp.push(newValue);
+```
+needs to become...
+```javascript
+this.state.mySchemeProp.push(newValue);
+```