updates readme with new demo

Author: Tom Saporito

README.md

@@ -179,7 +179,7 @@ const newState = {
 
 ## Demo
 
-https://codesandbox.io/embed/todo-with-undo-vgvl0?autoresize=1&fontsize=14
+https://codesandbox.io/s/substate-example-6qfbx
 
 ## Installation
 
@@ -261,13 +261,13 @@ These are the possible options
 - `@param` optional method parameter
 - `@param*` required method parameter
 
-| Method          | Desc                                                                                                                     |                                                                            Returns |
-| --------------- | ------------------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------: |
-| getState        | get a state `@param*` - index of state needed                                                                            |                                                                              state |
-| getCurrentState | get the current state                                                                                                    |                                                               current state object |
-| getProp         | get a prop from current state `@param*` - string path to prop                                                            |                                                               property you request |
-| changeState (WIP)    | change the version of the state `@param*` - `{requestedState: index of state, action: (optional name of event to emit)}` | emits `action` parameter event or 'STATE_CHANGED' event with the new current state |
-| resetState      | resets the `stateStorage` array to an empty array                                                                        |                                                                emits 'STATE_RESET' |
+| Method            | Desc                                                                                                                     |                                                                            Returns |
+| ----------------- | ------------------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------: |
+| getState          | get a state `@param*` - index of state needed                                                                            |                                                                              state |
+| getCurrentState   | get the current state                                                                                                    |                                                               current state object |
+| getProp           | get a prop from current state `@param*` - string path to prop                                                            |                                                               property you request |
+| changeState (WIP) | change the version of the state `@param*` - `{requestedState: index of state, action: (optional name of event to emit)}` | emits `action` parameter event or 'STATE_CHANGED' event with the new current state |
+| resetState        | resets the `stateStorage` array to an empty array                                                                        |                                                                emits 'STATE_RESET' |
 
 ## Event Methods