chore(package): update @types/node to version 12.0.3

Closes #33

Author: greenkeeper[bot]

package.json

@@ -33,7 +33,7 @@
     "@angular/language-service": "^7.1.1",
     "@types/jasmine": "^3.3.1",
     "@types/jasminewd2": "^2.0.6",
-    "@types/node": "^11.9.0",
+    "@types/node": "^12.0.3",
     "codecov": "^3.1.0",
     "codelyzer": "^4.5.0",
     "jasmine-core": "^3.3.0",