build(@angular/cli): update sourcemap-istanbul-instrumenter-loader

[filipesilva]

Thanks to @deepsweet for the license update!

Followup from webpack-contrib/istanbul-instrumenter-loader#39
Partially address #3884

BREAKING CHANGE:

The default LCOV file is now coverage/lcov.info instead of coverage/coverage.lcov.

ng test --code-coverage now uses karma-coverage-istanbul-reporter instead of karma-remap-istanbul.

To update follow these steps in your project:

• npm uninstall karma-remap-istanbul
• npm install karma-coverage-istanbul-reporter

Then copy karma.conf.js from a new project, or update it manually:

• replace require('karma-remap-istanbul'), with require('karma-coverage-istanbul-reporter'),
• replace ['progress', 'karma-remap-istanbul'] with ['progress', 'coverage-istanbul']
• replace

    remapIstanbulReporter: {
      reports: {
        html: 'coverage',
        lcovonly: './coverage/coverage.lcov'
      }
    },

with

    coverageIstanbulReporter: {
      reports: [ 'html', 'lcovonly' ],
      fixWebpackSourcePaths: true
    },

[hansl]

LGTM! Good work!

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