chore(package): update @types/node to version 10.12.18

Closes #26

Author: greenkeeper[bot]

package.json

@@ -31,7 +31,7 @@
     "@angular/language-service": "^6.0.0",
     "@types/jasmine": "~2.8.3",
     "@types/jasminewd2": "~2.0.2",
-    "@types/node": "~10.9.2",
+    "@types/node": "~10.12.18",
     "codelyzer": "^4.0.1",
     "jasmine-core": "~3.2.0",
     "jasmine-spec-reporter": "~4.2.1",