fix argument validation

jsteuer

2019-12-21 cd876c0026bf59831c0322946f0d73a8328c1b3f

 package-lock.json

@@ -1,6 +1,6 @@
{
  "name": "@mathcoach/ide-api",
  "version": "1.1.0",
  "version": "2.0.0",
  "lockfileVersion": 1,
  "requires": true,
  "dependencies": {