Bump postcss from 5.2.17 to 6.0.14

Bumps [postcss](https://github.com/postcss/postcss) from 5.2.17 to 6.0.14.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/master/CHANGELOG.md)
- [Commits](postcss/postcss@5.2.17...6.0.14)

package.json

@@ -44,7 +44,7 @@
     "p-map": "^1.1.1",
     "p-props": "^1.0.0",
     "pify": "^2.3.0",
-    "postcss": "^5.2.16",
+    "postcss": "^6.0.14",
     "stylus": "^0.54.5",
     "window-size": "^0.3.0"
   },

yarn.lock

@@ -157,6 +157,12 @@ ansi-styles@^2.2.1:
   version "2.2.1"
   resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-2.2.1.tgz#b432dd3358b634cf75e1e4664368240533c1ddbe"
 
+ansi-styles@^3.1.0:
+  version "3.2.0"
+  resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-3.2.0.tgz#c159b8d5be0f9e5a6f346dab94f16ce022161b88"
+  dependencies:
+    color-convert "^1.9.0"
+
 ansi-styles@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-1.0.0.tgz#cb102df1c56f5123eab8b67cd7b98027a0279178"
@@ -1545,6 +1551,14 @@ chalk@^1.0.0, chalk@^1.1.0, chalk@^1.1.1, chalk@^1.1.3:
     strip-ansi "^3.0.0"
     supports-color "^2.0.0"
 
+chalk@^2.3.0:
+  version "2.3.0"
+  resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.3.0.tgz#b5ea48efc9c1793dccc9b4767c93914d3f2d52ba"
+  dependencies:
+    ansi-styles "^3.1.0"
+    escape-string-regexp "^1.0.5"
+    supports-color "^4.0.0"
+
 charenc@~0.0.1:
   version "0.0.2"
   resolved "https://registry.yarnpkg.com/charenc/-/charenc-0.0.2.tgz#c0a1d2f3a7092e03774bfa83f14c0fc5790a8667"
@@ -1718,7 +1732,7 @@ color-blind@^0.1.0:
   dependencies:
     onecolor "^2.5.0"
 
-color-convert@^1.3.0:
+color-convert@^1.3.0, color-convert@^1.9.0:
   version "1.9.0"
   resolved "https://registry.yarnpkg.com/color-convert/-/color-convert-1.9.0.tgz#1accf97dd739b983bf994d56fec8f95853641b7a"
   dependencies:
@@ -6913,6 +6927,14 @@ postcss@^5.0, postcss@^5.0.0, postcss@^5.0.10, postcss@^5.0.11, postcss@^5.0.12,
     source-map "^0.5.6"
     supports-color "^3.2.3"
 
+postcss@^6.0.14:
+  version "6.0.14"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-6.0.14.tgz#5534c72114739e75d0afcf017db853099f562885"
+  dependencies:
+    chalk "^2.3.0"
+    source-map "^0.6.1"
+    supports-color "^4.4.0"
+
 preload-webpack-plugin@^1.2.2:
   version "1.2.2"
   resolved "https://registry.yarnpkg.com/preload-webpack-plugin/-/preload-webpack-plugin-1.2.2.tgz#d1b6f0eab3c2d0bb4c249d409cf6b7a8b0a415dd"
@@ -7820,6 +7842,10 @@ source-map@0.5.6, source-map@0.5.x, "source-map@>= 0.1.2", source-map@^0.5.0, so
   version "0.5.6"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.6.tgz#75ce38f52bf0733c5a7f0c118d81334a2bb5f412"
 
+source-map@^0.6.1:
+  version "0.6.1"
+  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"
+
 source-map@~0.4.2:
   version "0.4.4"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.4.4.tgz#eba4f5da9c0dc999de68032d8b4f76173652036b"
@@ -8077,6 +8103,12 @@ supports-color@^3.1.0, supports-color@^3.1.2, supports-color@^3.2.3:
   dependencies:
     has-flag "^1.0.0"
 
+supports-color@^4.0.0, supports-color@^4.4.0:
+  version "4.5.0"
+  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-4.5.0.tgz#be7a0de484dec5c5cddf8b3d59125044912f635b"
+  dependencies:
+    has-flag "^2.0.0"
+
 svg-sprite@^1.3.5:
   version "1.3.6"
   resolved "https://registry.yarnpkg.com/svg-sprite/-/svg-sprite-1.3.6.tgz#7933de073ff6671d2b13f2461e64df730eb8ab34"