Update karma-coverage-istanbul-reporter requirement from ^1.3.0 to ^2.0.6

[dependabot-preview]

Updates the requirements on karma-coverage-istanbul-reporter to permit the latest version.

Changelog

Sourced from karma-coverage-istanbul-reporter's changelog.

2.0.6 (2019-07-20)

Bug Fixes

• get source code from sourceMapStore on write report (619d90d), closes #72

2.0.5 (2019-02-17)

Bug Fixes

• correctly strip source file prefixes when no webpack.context is defined (3c48bf8)
• don't double-report files with mixed slashes in their names on windows (38087c2)

2.0.4 (2018-09-08)

Bug Fixes

• handle source roots being undefined on windows (8eba911), closes #55

2.0.3 (2018-09-01)

Bug Fixes

• update istanbuljs to 2.x (a835e22), closes #52
• use correct source file path separators on windows (938e93c), closes #47

2.0.2 (2018-08-24)

Bug Fixes

• files with no coverage should be preserved by default (#54) (e5a5545), closes #53

... (truncated)

Commits

• 8fee4a9 chore(release): 2.0.6
• 7a34b47 Merge branch 'master' of github.com:mattlewis92/karma-coverage-istanbul-reporter
• ca17ed1 build: fix code coverage
• 619d90d fix: get source code from sourceMapStore on write report
• 5496d47 style: reformat code with prettier
• 0261f70 build: upgrade dependencies
• a2c359b docs: format readme
• df3d5df chore: share probot config
• b55478f build: add issue template enforcer
• 65e0b5d docs: add patreon
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #39.