chore(package): update remap-istanbul to version 0.12.0

Author: greenkeeper[bot]

package.json

@@ -87,7 +87,7 @@
     "prettier": "^1.14.2",
     "publish-please": "^3.2.0",
     "reflect-metadata": "^0.1.12",
-    "remap-istanbul": "^0.11.1",
+    "remap-istanbul": "^0.12.0",
     "rimraf": "^2.6.2",
     "sinon": "^6.1.5",
     "sinon-chai": "^3.2.0",