title: Property 'startTracking' does not exist on type 'Angulartics2GoogleAnalytics'
body: <p>I've followed the readme of <a href="https://github.com/angulartics/angulartics2" rel="nofollow noreferrer">https://github.com/angulartics/angulartics2</a>. but I get the error:</p>
  
  <p><code>ERROR in src/app/app.component.ts(21,33): error TS2339: Property 'startTracking' does not exist on type 'Angulartics2GoogleAnalytics'.</code></p>
  
  <p>I'm assuminging I have some problems with the versions of my dependencies, a similiar thread (<a href="https://stackoverflow.com/questions/51584799/angulartics2-starttracking-does-not-exist-on-type-angulartics2googleanalytic">Angulartics2: startTracking() does not exist on type &#39;Angulartics2GoogleAnalytics&#39;</a>) Suggests the dependecies should be "rxjs": "6.0.0" and typesript should be higher than 2.6. However I still get the problem.</p>
  
  <p>Any ideas?</p>
  
  <p>my package.json
  <code>
  {
    "name": "flow-app",
    "version": "1.1.0",
    "license": "MIT",
    "scripts": {
      "ng": "ng",
      "start": "ng serve",
      "build": "ng build",
      "test": "ng test",
      "lint": "ng lint",
      "e2e": "ng e2e",
      "build:preprod": "ng build --prod --source-map --configuration=preprod --base-href /dist/",
      "build:prod": "ng build --prod --build-optimizer --configuration=production --base-href /dist/"
    },
    "private": true,
    "dependencies": {
      "@angular/animations": "^5.1.0",
      "@angular/cdk": "^5.0.0",
      "@angular/common": "^5.1.0",
      "@angular/compiler": "^5.1.0",
      "@angular/core": "^5.1.0",
      "@angular/forms": "^5.1.0",
      "@angular/http": "^5.0.0",
      "@angular/material": "^5.2.5",
      "@angular/platform-browser": "^5.0.0",
      "@angular/platform-browser-dynamic": "^5.0.0",
      "@angular/router": "^5.0.0",
      "@ng-bootstrap/ng-bootstrap": "^1.0.0-beta.7",
      "angulartics2": "^6.3.1",
      "classlist.js": "^1.1.20150312",
      "core-js": "^2.4.1",
      "ng2-opd-popup": "^1.1.21",
      "rxjs": "6.0.0",
      "rxjs-compat": "6.0.0",
      "web-animations-js": "^2.3.1",
      "zone.js": "^0.8.14",
      "ajv": "^6.9.1"
    },
    "devDependencies": {
      "@angular-devkit/build-angular": "^0.13.3",
      "@angular/cli": "^6.2.3",
      "@angular/compiler-cli": "^5.0.0",
      "@angular/language-service": "^5.0.0",
      "@types/jasmine": "~2.5.53",
      "@types/jasminewd2": "~2.0.2",
      "@types/node": "~6.0.60",
      "codelyzer": "~3.2.0",
      "jasmine-core": "~2.6.2",
      "jasmine-spec-reporter": "~4.1.0",
      "karma": "~1.7.0",
      "karma-chrome-launcher": "~2.1.1",
      "karma-cli": "~1.0.1",
      "karma-coverage-istanbul-reporter": "^1.2.1",
      "karma-jasmine": "~1.1.0",
      "karma-jasmine-html-reporter": "^0.2.2",
      "protractor": "^5.4.2",
      "ts-node": "~3.2.0",
      "tslint": "~5.7.0",
      "typescript": "^2.6.2"
    }
  }
  </code></p>