fix(package): update chai-http to version 4.1.0

Closes #24

Author: greenkeeper[bot]

package.json

@@ -29,7 +29,7 @@
     "@angular/router": "^5.2.6",
     "body-parser": "^1.18.2",
     "chai": "^4.1.2",
-    "chai-http": "^3.0.0",
+    "chai-http": "^4.1.0",
     "cookie-parser": "latest",
     "core-js": "^2.5.3",
     "cors": "^2.8.4",