build: fix travis script, stop testing node 4

Author: dpopp07

.travis.yml

@@ -1,7 +1,6 @@
 language: node_js
 sudo: false
 node_js:
-- 4
 - 6
 - 8
 before_install:
@@ -11,8 +10,11 @@ before_install:
 - npm install -g typescript
 script:
 - tsc
-- if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then npm run test-travis; fi
-- if [ "${TRAVIS_PULL_REQUEST}" = "true" ]; then npm run test-unit; fi
+- if [ "${TRAVIS_PULL_REQUEST}" = "false" ];
+    then npm run test-travis;
+  else
+    npm run test-unit;
+  fi
 - sh scripts/typedoc/generate_typedoc.sh
 after_success:
 - npm run report-coverage

lib/base_service.ts

@@ -19,6 +19,7 @@
 import bufferFrom = require('buffer-from');
 import extend = require('extend');
 import request = require('request');
+import semver = require('semver');
 import vcapServices = require('vcap_services');
 import { IamTokenManagerV1 } from '../iam-token-manager/v1';
 import { stripTrailingSlash } from './helper';
@@ -120,6 +121,10 @@ export class BaseService {
         'the "new" keyword is required to create Watson service instances'
       );
     }
+    const isNodeFour = semver.satisfies(process.version, '4.x')
+    if (isNodeFour) {
+      console.warn('WARNING: Support for Node v4.x is deprecated and will no longer be tested. Support will be officially dropped in the next major version.');
+    }
     const options = extend({}, userOptions);
     const _options = this.initCredentials(options);
     // If url is not specified, visual recognition requires gateway-a for CF instances

package.json

@@ -94,6 +94,7 @@
     "object.omit": "~3.0.0",
     "object.pick": "~1.3.0",
     "request": "~2.87.0",
+    "semver": "^5.6.0",
     "vcap_services": "~0.3.4",
     "websocket": "~1.0.26"
   },