fix(core): Corrected the RuntimeError class so that the name of the c…

…onstructor is present in the st

.travis.yml

@@ -12,6 +12,7 @@ notifications:
     on_failure: always  # options: [always|never|change] default: always
     on_start: never     # options: [always|never|change] default: always
 node_js:
+  - '6'
   - '8'
   - '10'
 before_install: scripts/travis/before_install.sh