Upgrade the version of karma-covrage-istanbul-reporter

[yfain]

- [ ] bug report -> please search issues before submitting
- [x ] feature request

Angular CLI 1.0.1 generates package.json that include an old version of the coverage plugin:

    "karma-coverage-istanbul-reporter": "^0.2.0"

As a result, trying to set the thresholds for coverage doesn't work. Upgrade this dependency to

    "karma-coverage-istanbul-reporter": "^1.2.0"

This will allow to make the tests with low coverage fail by adding thresholds to karma.conf.js, for example:

coverageIstanbulReporter: {
      reports: ['html', 'lcovonly'],
      fixWebpackSourcePaths: true,
      thresholds: {
        global: { // thresholds for all files
          statements: 80,
          lines: 80,
          branches: 80,
          functions: 80
        },
        each: { // thresholds per file
          statements: 80,
          lines: 80,
          branches: 80,
          functions: 80
        }
      }
    }

[filipesilva]

Fixed by #5519, which should get the latest version.

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