fix npmignore stuff

Author: bobzhang

.npmignore

@@ -35,3 +35,4 @@ vendor/cppo
 vendor/rollup.js
 package/
 *.tgz
+.nyc_output/

jscomp/artifacts.json

@@ -443,15 +443,6 @@
     "belt_HashSetString.cmi",
     "belt_Id.cmi",
     "belt_Int.cmi",
-    "belt_internalAVLset.cmi",
-    "belt_internalAVLtree.cmi",
-    "belt_internalBuckets.cmi",
-    "belt_internalBucketsType.cmi",
-    "belt_internalMapInt.cmi",
-    "belt_internalMapString.cmi",
-    "belt_internalSetBuckets.cmi",
-    "belt_internalSetInt.cmi",
-    "belt_internalSetString.cmi",
     "belt_List.cmi",
     "belt_Map.cmi",
     "belt_MapDict.cmi",
@@ -1100,6 +1091,7 @@
     "dedupe.js",
     "doc_gen.js",
     "install.js",
+    "installUtils.js",
     "js_internal_gen.js",
     "ninja.js",
     "ninjaFactory.js",