add postcss to dev deps

Author: mkg0

package.json

@@ -64,6 +64,7 @@
     "html-webpack-plugin": "^2.30.1",
     "jest": "^22.1.4",
     "normalize.css": "^7.0.0",
+    "postcss": "^7.0.1",
     "postcss-import": "^11.0.0",
     "postcss-loader": "^2.0.10",
     "precss": "^2.0.0",

yarn.lock

@@ -174,6 +174,12 @@ ansi-styles@^3.1.0, ansi-styles@^3.2.0:
   dependencies:
     color-convert "^1.9.0"
 
+ansi-styles@^3.2.1:
+  version "3.2.1"
+  resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-3.2.1.tgz#41fbb20243e50b12be0f04b8dedbf07520ce841d"
+  dependencies:
+    color-convert "^1.9.0"
+
 anymatch@^1.3.0:
   version "1.3.2"
   resolved "https://registry.yarnpkg.com/anymatch/-/anymatch-1.3.2.tgz#553dcb8f91e3c889845dfdba34c77721b90b9d7a"
@@ -1306,6 +1312,14 @@ chalk@^2.0.0, chalk@^2.0.1, chalk@^2.1.0, chalk@^2.3.0:
     escape-string-regexp "^1.0.5"
     supports-color "^4.0.0"
 
+chalk@^2.4.1:
+  version "2.4.1"
+  resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.4.1.tgz#18c49ab16a037b6eb0152cc83e3471338215b66e"
+  dependencies:
+    ansi-styles "^3.2.1"
+    escape-string-regexp "^1.0.5"
+    supports-color "^5.3.0"
+
 chardet@^0.4.0:
   version "0.4.2"
   resolved "https://registry.yarnpkg.com/chardet/-/chardet-0.4.2.tgz#b5473b33dc97c424e5d98dc87d55d4d8a29c8bf2"
@@ -2888,6 +2902,10 @@ has-flag@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/has-flag/-/has-flag-2.0.0.tgz#e8207af1cc7b30d446cc70b734b5e8be18f88d51"
 
+has-flag@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/has-flag/-/has-flag-3.0.0.tgz#b5d454dc2199ae225699f3467e5a07f3b955bafd"
+
 has-symbols@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/has-symbols/-/has-symbols-1.0.0.tgz#ba1a8f1af2a0fc39650f5c850367704122063b44"
@@ -5143,6 +5161,14 @@ postcss@^6.0.1:
     source-map "^0.6.1"
     supports-color "^5.1.0"
 
+postcss@^7.0.1:
+  version "7.0.1"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.1.tgz#db20ca4fc90aa56809674eea75864148c66b67fa"
+  dependencies:
+    chalk "^2.4.1"
+    source-map "^0.6.1"
+    supports-color "^5.4.0"
+
 precss@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/precss/-/precss-2.0.0.tgz#7f567e3318e06d44c8fdbf9e58452e8358bf4b71"
@@ -6205,6 +6231,12 @@ supports-color@^5.1.0:
   dependencies:
     has-flag "^2.0.0"
 
+supports-color@^5.3.0, supports-color@^5.4.0:
+  version "5.4.0"
+  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-5.4.0.tgz#1c6b337402c2137605efe19f10fec390f6faab54"
+  dependencies:
+    has-flag "^3.0.0"
+
 svgo@^0.7.0:
   version "0.7.2"
   resolved "https://registry.yarnpkg.com/svgo/-/svgo-0.7.2.tgz#9f5772413952135c6fefbf40afe6a4faa88b4bb5"