Fix numbers not allowed in ev3devBrowser.env variable names

Author: dlech

CHANGELOG.md

@@ -10,6 +10,7 @@ Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how
   interactive terminal instead of output pane
 ### Fixed
 - Fix debugger restart button not working
+- Fix numbers not allowed in `ev3devBrowser.env` variable names
 ### Changed
 - SSH shell no longer requires native executable on Windows
 

package.json

@@ -41,7 +41,7 @@
                     "scope": "window",
                     "type": "object",
                     "patternProperties": {
-                        "[A-Za-z_]{1,}": {
+                        "[A-Za-z0-9_]{1,}": {
                             "type": "string"
                         }
                     },