Bump angular from 1.6.1 to 1.8.0

Bumps [angular](https://github.com/angular/angular.js) from 1.6.1 to 1.8.0.
- [Release notes](https://github.com/angular/angular.js/releases)
- [Changelog](https://github.com/angular/angular.js/blob/master/CHANGELOG.md)
- [Commits](angular/angular.js@v1.6.1...v1.8.0)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

npm-shrinkwrap.json

@@ -15,7 +15,7 @@
   },
   "dependencies": {
     "@openmrs/angularjs-openmrs-api": "0.8.1",
-    "angular": "1.6.1",
+    "angular": "1.8.0",
     "angular-animate": "1.5.8",
     "angular-chart.js": "^1.1.1",
     "angular-resource": "1.5.8",