travis: remove chakracore on travis

1. node-chakracore v8 doesn’t expose napi version
2. node-chakracore v10 doesn’t throws on handlescope double escape

.travis.yml

@@ -12,20 +12,11 @@ env:
     # https://github.com/jasongin/nvs/blob/master/doc/CI.md
     - NVS_VERSION=1.4.2
   matrix:
-    - NODEJS_VERSION=node/4
     - NODEJS_VERSION=node/6
     - NODEJS_VERSION=node/8
-    - NODEJS_VERSION=node/9
     - NODEJS_VERSION=node/10
-    - NODEJS_VERSION=chakracore/8
-    - NODEJS_VERSION=chakracore/10
-    - NODEJS_VERSION=nightly
-    - NODEJS_VERSION=chakracore-nightly
 matrix:
   fast_finish: true
-  allow_failures:
-    - env: NODEJS_VERSION=nightly
-    - env: NODEJS_VERSION=chakracore-nightly
 sudo: false
 cache:
   directories:

test/index.js

@@ -45,6 +45,7 @@ let testModules = [
 ];
 
 const napiVersion = process.env.npm_config_NAPI_VERSION || process.versions.napi
+console.log(`NAPI version defined as ${napiVersion}\n`);
 
 if (napiVersion < 50000) {
   // currently experimental only test if NAPI_VERSION