Merge pull request #42 from microsoft/jennmar/npmPackageFix

Updating source-map npm reference to over 0.7.4 to fix bug

Author: jennifermarsman

package-lock.json

@@ -20,6 +20,7 @@
     "@minecraft/server-admin": "^1.0.0-beta.11940b24",
     "@minecraft/server-gametest": "^1.0.0-beta.11940b24",
     "@minecraft/server-net": "^1.0.0-beta.11940b24",
-    "gulp-sourcemaps": "^3.0.0"
+    "gulp-sourcemaps": "^3.0.0",
+    "source-map": "^0.7.4"
   }
 }