Set development version number

modules/core/context.js

@@ -26,7 +26,7 @@ export function coreContext() {
   let context = utilRebind({}, dispatch, 'on');
   let _deferred = new Set();
 
-  context.version = '2.20.2';
+  context.version = '2.21.0-dev';
   context.privacyVersion = '20201202';
 
   // iD will alter the hash so cache the parameters intended to setup the session

package.json

@@ -1,6 +1,6 @@
 {
   "name": "iD",
-  "version": "2.20.2",
+  "version": "2.21.0-dev",
   "description": "A friendly editor for OpenStreetMap",
   "main": "dist/iD.min.js",
   "repository": "github:openstreetmap/iD",