use ts-node to get correct line numbers

Author: Almenon

package.json

@@ -6,7 +6,7 @@
     "python"
   ],
   "scripts": {
-    "test": "tsc -p ./ && mocha",
+    "test": "tsc -p ./ && mocha -r ts-node/register",
     "appveyorTest": "tsc -p ./ && nyc mocha --reporter mocha-appveyor-reporter test/*.js",
     "compile": "tsc -watch -p ./"
   },