Update dependency postcss-loader to v2

[renovate-tests]

This Pull Request updates dependency postcss-loader from v1.3.3 to v2.0.6

Commits

postcss/postcss-loader

2.0.6

• b5b3188 chore(release): 2.0.6
• b313478 fix(index): simplify config loading behaviour (#​259)
• 2ef4449 docs(README): inconsistent use of cssnext && postcss-cssnext references
• 45d10ce ci(travis): rm yarn
• 76d7c33 chore(package): update dependencies
• 4974607 fix: allow to pass an {Object} (options.parser) (#​257)
• adcbb2e fix: misspelling in warnings (#​237)
• f7aa9a8 docs(README): added missing comma (#​233)
• 9785226 test: refactor using .config.js (JS) for test configs (#​230)

2.0.5

• 12c19b9 chore(release): 2.0.5
• dca52a9 fix: regression with options.plugins {Function} (webpack.config.js) (#​229)

2.0.4

• cc6544e chore(release): 2.0.4
• faaeee4 fix(index): postcss.config.js not resolved correctly (options.config)
• 4f20c99 fix(index): update validation schema, better warning message
• 3963860 docs(README): add missing comma (#​223)
• df0226b docs(README): add missing comma (#​225)

2.0.3

• 6388f0b chore(release): 2.0.3
• 159b66a fix(index): don't fail on 'sourceMap: false' && emit a warning instead, when previous map found (options.sourceMap)

2.0.2

• fbef238 chore(release): 2.0.2
• e764761 fix(index): 'No PostCSS Config found' (options.config) (#​215)
• 2192d46 docs(README): rename cssnext to postcss-cssnext (#​216)
• 63f3b14 docs(README): add missing comma (#​214)
• e57cd91 docs(README): add missing comas in code examples (#​211)

2.0.1

• da378e5 chore(release): 2.0.1
• c4f0064 fix(index): 'Cannot create property prev on boolean false' (options.sourceMap)

2.0.0

• e586f4a chore(release): 2.0.0
• 40d2268 chore(package): add standard-version
• 0b63024 chore(index): v2.0.0 (#​191)
• 2b76df8 feat(index): add options validation
• 0dceb2c feat(index): add ctx, ctx.file, ctx.options
• d591cdf doc(): update webpack v2 part (#​186)

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