chore(deps): update dependency babel-plugin-istanbul to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
babel-plugin-istanbul	^4.1.6 -> ^6.0.0

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Release Notes

istanbuljs/babel-plugin-istanbul (babel-plugin-istanbul)

v6.1.1

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v6.0.0

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⚠ BREAKING CHANGES

• Drop node.js 6 (#​226)

Features

• Add support for instrumenter options (#​227) (fe08f5b), closes #​208 #​212
• Drop node.js 6 (#​226) (93db21a), closes #​209

v5.2.0

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Bug Fixes

• Print explicit error if use with babel 6 is attempted (#​207) (a12cf16)

Features

• Support turning off node_modules default exclude via flag (#​172) (a314f06)

v5.1.4

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v5.1.3

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Bug Fixes

• Revert #​192 (201a933) due to regression detailed at #​201

v5.1.2

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Bug Fixes

• Ensure correct scope references after traversal (#​192) (201a933)

v5.1.1

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Bug Fixes

• respect changes of cwd in options (#​171) (adec723)

v5.1.0

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Features

• Bump dependencies. (b509649)

5.0.1 (2018-07-24)

v5.0.1

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5.0.1 (2018-07-24)

v5.0.0

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Features

• upgrade to babel 7 and newest istanbul libraries (#​158) (a9e1564)

BREAKING CHANGES

• Drop node 4 support, upgrade to babel 7, stop shipping @​babel/plugin-syntax-object-rest-spread

4.1.6 (2018-03-09)

• chore: explicit update of istanbul dependencies (#​149) (77b6eb7), closes #​149
• chore(package): update coveralls to version 3.0.0 (#​133) (7045a03), closes #​133
• chore(package): update mocha to version 4.0.0 (#​134) (38176ba), closes #​134
• fix: babel-preset-es2015 => babel-preset-env (#​138) (18fe954), closes #​138
• fix: include object-spread-syntax plugin (#​141) (428a952), closes #​141

4.1.5 (2017-08-23)

4.1.4 (2017-05-27)

4.1.3 (2017-04-29)

4.1.2 (2017-03-27)

4.1.1 (2017-03-22)

Bug Fixes

• explicit upgrade to patched version of istanbul-lib-instrument (db8ecbe)

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