[license] use EPL-2.0

The Theia project, from which the main script here is from originally,
has a secondary license (GPL-2.0-only WITH Classpath-exception-2.0).
It's useful there for distribution/integration of Theia by 3rd parties,
but would apparently serve no purpose for a build and test dependency
such as the dash-licenses-wrapper.

As of this writing, the original script, "check_3pp_licenses.js" [1] has
been contributed-to only by Ericsson employees, and so we have the
power to re-license if necessary (in the case where it's not proper to
drop the second part of the original license expression:
"OR GPL-2.0-only WITH Classpath-exception-2.0").

[1]: Paul Marechal, Vincent Fugnitto and myself:
   https://github.com/eclipse-theia/theia/blame/v1.43.0/scripts/check_3pp_licenses.js
Signed-off-by: Marc Dumais <[email protected]>

nodejs-wrapper/package.json

@@ -9,7 +9,11 @@
     "dash-licenses-wrapper": "src/dash-licenses-wrapper.js"
   },
   "scripts": {
-    "test": "test"
+    "test": "mocha --reporter spec"
+  },
+  "devDependencies": {
+    "chai": "^4.3.10",
+    "mocha": "^10.2.0"
   },
   "repository": {
     "type": "git",
@@ -23,7 +27,7 @@
     "Eclipse Foundation"
   ],
   "author": "Ericsson and others",
-  "license": "EPL-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0",
+  "license": "EPL-2.0",
   "bugs": {
     "url": "https://github.com/eclipse/dash-licenses/issues"
   },