chore: include missing dependency

Author: SvetoslavTsenov

demo/AngularApp/package.json

@@ -39,6 +39,7 @@
     "chai-as-promised": "~7.1.1",
     "lazy": "1.0.11",
     "mocha": "~5.2.0",
+    "chai": "4.2.0",
     "mochawesome": "~3.1.2",
     "nativescript-dev-appium": "next",
     "nativescript-dev-webpack": "next",

demo/JavaScriptApp/package.json

@@ -24,6 +24,7 @@
     "babel-types": "6.26.0",
     "babylon": "6.18.0",
     "lazy": "1.0.11",
+    "chai": "4.2.0",
     "mocha": "~5.2.0",
     "mochawesome": "~3.1.2",
     "nativescript-dev-appium": "next",

demo/TypeScriptApp/package.json

@@ -25,6 +25,7 @@
     "babylon": "6.18.0",
     "lazy": "1.0.11",
     "mocha": "~5.2.0",
+    "chai": "4.2.0",
     "mochawesome": "~3.1.2",
     "nativescript-dev-appium": "next",
     "nativescript-dev-webpack": "next",