Exclude demo app unit tests for the moment

Author: santam85

apps/ng2-charts-demo/src/app/bubble-chart/bubble-chart.component.ts

@@ -1,4 +1,4 @@
-import { Component, OnInit } from '@angular/core';
+import { Component } from '@angular/core';
 import { ChartConfiguration, ChartData, ChartEvent, ChartType } from 'chart.js';
 
 @Component({