fix(deps): update dependency postcss-loader to v2.1.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-loader	2.0.8 -> 2.1.6

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Release Notes

webpack-contrib/postcss-loader

v2.1.6

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Bug Fixes

• package: config memory leak, updates postcss-load-config v1.2.0...2.0.0 (dependencies) (0547b12)

v2.1.5

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Bug Fixes

• index: remove sourceMap warning (#​361) (4416791)

v2.1.4

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Bug Fixes

• restore loader object in postcss config context (#​355) (2ff1735)

v2.1.3

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Bug Fixes

• options: revert additionalProperties changes to keep SemVer (bd7fc38)

v2.1.2

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Bug Fixes

• options: disallow additional properties and add ident to validation (#​346) (82ef553)

v2.1.1

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Bug Fixes

• index: don't set to value (options) (#​339) (cdbb8b6)

v2.1.0

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Bug Fixes

• index: continue watching after dependency {Error} (#​332) (a8921cc)

Features

• index: pass AST (result.root) && Messages (result.messages) as metadata to other loaders (#​322) (56232e7)

2.0.10 (2018-01-03)

Bug Fixes

• index: copy loader options before modifying (#​326) (61ff03c)

2.0.9 (2017-11-24)

Bug Fixes

• index: filter ident (options.ident) (#​315) (3e1c7fa)

2.0.8 (2017-10-14)

Bug Fixes

• lib/options: handle {Object} return (options.plugins) (#​301) (df010a7)
• schema: allow to pass an {Object} (options.syntax/options.stringifier) (#​300) (58e9996)

2.0.7 (2017-10-10)

Bug Fixes

• sanitizing from and to options (postcss.config.js) (#​260) (753dea7)
• index: runaway promise (#​269) (8df20ce)

2.0.6 (2017-06-14)

Bug Fixes

• allow to pass an {Object} (options.parser) (#​257) (4974607)
• misspelling in warnings (#​237) (adcbb2e)
• index: simplify config loading behaviour (#​259) (b313478)

2.0.5 (2017-05-10)

Bug Fixes

• regression with options.plugins {Function} (webpack.config.js) (#​229) (dca52a9)

2.0.4 (2017-05-10)

Bug Fixes

• index: postcss.config.js not resolved correctly (options.config) (faaeee4)
• index: update validation schema, better warning message (4f20c99)

2.0.3 (2017-05-09)

Bug Fixes

• index: don't fail on 'sourceMap: false' && emit a warning instead, when previous map found (options.sourceMap) (159b66a)

2.0.2 (2017-05-09)

Bug Fixes

• index: 'No PostCSS Config found' (options.config) (#​215) (e764761)

2.0.1 (2017-05-08)

Bug Fixes

• index: 'Cannot create property prev on boolean false' (options.sourceMap) (c4f0064)

v2.0.10

Compare Source

Bug Fixes

• index: copy loader options before modifying (#​326) (61ff03c)

v2.0.9

Compare Source

Bug Fixes

• index: filter ident (options.ident) (#​315) (3e1c7fa)

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