Update post-css

[LaseII]

Hello,

on consumer side of this package we run into issues with not synced post-css versions.

Unknown error from PostCSS plugin. Your current PostCSS version is 7.0.14, but postcss-modules-scope uses 6.0.23.

Not sure if that update could fix usage of electrons inside multiple css selctors. But can we give it a try ?

yarn list --pattern postcss              
yarn list v1.18.0
├─ @dx/cli@0.0.1
│  └─ postcss@7.0.26
├─ @utilitycss/utility@0.5.1
│  └─ postcss@7.0.26
├─ autoprefixer@8.6.5
│  └─ postcss@6.0.23
├─ css-loader@1.0.1
│  ├─ postcss-modules-extract-imports@1.2.1
│  └─ postcss@6.0.23
├─ css-modules-loader-core@1.1.0
│  └─ postcss@6.0.1
├─ cssnano-preset-default@4.0.7
│  ├─ postcss-calc@7.0.1
│  └─ postcss-selector-parser@5.0.0
├─ cssstats@3.4.0
│  └─ postcss@6.0.23
├─ gatsby-plugin-material-ui@2.1.6
│  ├─ postcss-value-parser@4.0.0
│  └─ postcss@7.0.17
├─ gatsby@2.19.12
│  ├─ postcss-value-parser@4.0.2
│  └─ postcss@7.0.26
├─ icss-utils@2.1.0
│  └─ postcss@6.0.23
├─ pixrem@4.0.1
│  └─ postcss@6.0.23
├─ pleeease-filters@4.0.0
│  └─ postcss@6.0.23
├─ postcss-apply@0.8.0
│  └─ postcss@6.0.23
├─ postcss-attribute-case-insensitive@2.0.0
│  ├─ postcss-selector-parser@2.2.3
│  └─ postcss@6.0.23
├─ postcss-calc@6.0.2
│  └─ postcss-selector-parser@2.2.3
├─ postcss-cli@7.1.0
├─ postcss-color-function@4.1.0
│  └─ postcss@6.0.23
├─ postcss-color-gray@4.1.0
│  └─ postcss@6.0.23
├─ postcss-color-hex-alpha@3.0.0
│  └─ postcss@6.0.23
├─ postcss-color-hsl@2.0.0
│  └─ postcss@6.0.23
├─ postcss-color-hwb@3.0.0
│  └─ postcss@6.0.23
├─ postcss-color-rebeccapurple@3.1.0
│  └─ postcss@6.0.23
├─ postcss-color-rgb@2.0.0
│  └─ postcss@6.0.23
├─ postcss-color-rgba-fallback@3.0.0
│  └─ postcss@6.0.23
├─ postcss-colormin@4.0.3
├─ postcss-combine-duplicated-selectors@8.1.0
│  └─ postcss-selector-parser@6.0.2
├─ postcss-convert-values@4.0.1
├─ postcss-cssnext@3.1.0
│  └─ postcss@6.0.23
├─ postcss-custom-media@6.0.0
│  └─ postcss@6.0.23
├─ postcss-custom-properties@6.3.1
│  └─ postcss@6.0.23
├─ postcss-custom-selectors@4.0.1
│  └─ postcss@6.0.23
├─ postcss-discard-comments@4.0.2
├─ postcss-discard-duplicates@4.0.2
├─ postcss-discard-empty@4.0.1
├─ postcss-discard-overridden@4.0.1
├─ postcss-discard-unused@4.0.1
├─ postcss-flexbugs-fixes@3.3.1
│  └─ postcss@6.0.23
├─ postcss-font-family-system-ui@3.0.0
│  └─ postcss@6.0.23
├─ postcss-font-variant@3.0.0
│  └─ postcss@6.0.23
├─ postcss-for@2.1.1
│  ├─ postcss-simple-vars@2.0.0
│  └─ postcss@5.2.18
├─ postcss-image-set-polyfill@0.3.5
│  └─ postcss@6.0.23
├─ postcss-import@11.1.0
│  └─ postcss@6.0.23
├─ postcss-initial@2.0.0
│  └─ postcss@6.0.23
├─ postcss-load-config@2.0.0
├─ postcss-loader@2.1.6
│  └─ postcss@6.0.23
├─ postcss-media-minmax@3.0.0
│  └─ postcss@6.0.23
├─ postcss-media-query-parser@0.2.3
├─ postcss-merge-idents@4.0.1
├─ postcss-merge-longhand@4.0.11
├─ postcss-merge-rules@4.0.3
├─ postcss-message-helpers@2.0.0
├─ postcss-minify-font-values@4.0.2
├─ postcss-minify-gradients@4.0.2
├─ postcss-minify-params@4.0.2
├─ postcss-minify-selectors@4.0.2
├─ postcss-modules-extract-imports@1.1.0
│  └─ postcss@6.0.23
├─ postcss-modules-local-by-default@1.2.0
│  └─ postcss@6.0.23
├─ postcss-modules-scope@1.1.0
│  └─ postcss@6.0.23
├─ postcss-modules-values@1.3.0
│  └─ postcss@6.0.23
├─ postcss-modules@1.4.1
├─ postcss-nested@4.2.1
│  ├─ postcss-selector-parser@6.0.2
│  └─ postcss@7.0.26
├─ postcss-nesting@4.2.1
│  └─ postcss@6.0.23
├─ postcss-normalize-charset@4.0.1
├─ postcss-normalize-display-values@4.0.2
├─ postcss-normalize-positions@4.0.2
├─ postcss-normalize-repeat-style@4.0.2
├─ postcss-normalize-string@4.0.2
├─ postcss-normalize-timing-functions@4.0.2
├─ postcss-normalize-unicode@4.0.1
├─ postcss-normalize-url@4.0.1
├─ postcss-normalize-whitespace@4.0.2
├─ postcss-ordered-values@4.1.2
├─ postcss-pseudo-class-any-link@4.0.0
│  ├─ postcss-selector-parser@2.2.3
│  └─ postcss@6.0.23
├─ postcss-pseudoelements@5.0.0
│  └─ postcss@6.0.23
├─ postcss-reduce-idents@4.0.2
├─ postcss-reduce-initial@4.0.3
├─ postcss-reduce-transforms@4.0.2
├─ postcss-replace-overflow-wrap@2.0.0
│  └─ postcss@6.0.23
├─ postcss-reporter@6.0.1
│  └─ postcss@7.0.26
├─ postcss-safe-parser@3.0.1
│  └─ postcss@6.0.23
├─ postcss-selector-matches@3.0.1
│  └─ postcss@6.0.23
├─ postcss-selector-not@3.0.1
│  └─ postcss@6.0.23
├─ postcss-selector-parser@3.1.1
├─ postcss-simple-vars@5.0.2
├─ postcss-svgo@4.0.2
├─ postcss-unique-selectors@4.0.1
├─ postcss-value-parser@3.3.1
├─ postcss-values-parser@1.5.0
├─ postcss-zindex@4.0.1
└─ postcss@7.0.14

yarn why postcss-modules-scope 
yarn why v1.18.0
[1/4] 🤔  Why do we have the module "postcss-modules-scope"...?
[2/4] 🚚  Initialising dependency graph...
[3/4] 🔍  Finding dependency...
[4/4] 🚡  Calculating file sizes...
=> Found "postcss-modules-scope@1.1.0"
info Reasons this module exists
   - "_project_#@utilitycss#atomic#postcss-modules#css-modules-loader-core" depends on it
   - Hoisted from "_project_#@utilitycss#atomic#postcss-modules#css-modules-loader-core#postcss-modules-scope"
   - Hoisted from "_project_#@dx#dev-ui#gatsby#css-loader#postcss-modules-scope"
info Disk size without dependencies: "816KB"
info Disk size with unique dependencies: "1.84MB"
info Disk size with transitive dependencies: "5.24MB"
info Number of shared dependencies: 18