chore: release 1.4.0 (#442)

* updated CHANGELOG.md [ci skip]

* updated package.json [ci skip]

* updated samples/package.json [ci skip]

Author: yoshi-automation

vision/samples/package.json

@@ -13,7 +13,7 @@
     "test": "mocha system-test --timeout 600000"
   },
   "dependencies": {
-    "@google-cloud/vision": "^1.3.0",
+    "@google-cloud/vision": "^1.4.0",
     "canvas": "^2.0.0",
     "mathjs": "^6.0.0",
     "natural": "^0.6.1",