Update stylelint rules

Author: JayPanoz

css/postcss.config.js

@@ -19,36 +19,33 @@ module.exports = (ctx) => ({
               "message": "Please remove empty comments."
           }]
           , "number-max-precision": 4
-          , "unit-blacklist": [ ["pt"], {
+          , "unit-disallowed-list": [ ["pt"], {
               "message": "Sorry, this unit is not allowed. Please use another one."
             , "severity": "error"
           }]
           , "custom-property-pattern": [ "(RS|USER)__.+", {
               "message": "It looks like you’re using a CSS variable prefix which is not supported. It should either start with “--RS__” or “--USER__”."
             , "severity": "error"
           }]
-          , "selector-max-empty-lines": 0
           , "color-hex-length": [ "long", {
               "message": "We recommend using long color HEX to prevent unexpected issues."
           }]
           , "font-family-name-quotes": [ "always-where-recommended", {
               "message": "If looks like there are spaces or digits in your “font-family”, please use quotes."
           }]
           , "function-url-quotes": "always"
-          , "number-leading-zero": "always"
-          , "number-no-trailing-zeros": true
           , "length-zero-no-unit": [ true, {
               "message": "The value of this property being 0, you don’t need an unit. Please remove it."
           }]
-          , "unit-case": "lower"
+          , "selector-type-case": "lower"
+          , "function-name-case": "lower"
+          , "value-keyword-case": "lower"
           , "selector-attribute-quotes": "always"
           , "comment-whitespace-inside": "always"
-          , "max-empty-lines": 1
-          , "indentation": [ 2, {
-              "message": "You should use 2 spaces to indent."
-          }]
+          , "at-rule-empty-line-before": "always"
+          , "comment-empty-line-before": "always"
+          , "rule-empty-line-before": "always"
           , "no-duplicate-at-import-rules": true
-          , "no-extra-semicolons": true
           , "no-invalid-double-slash-comments": [ true, {
               "message": "It looks like you’re using single-line JS comments. This is CSS, you can’t use that."
             , "severity": "error"
@@ -57,13 +54,6 @@ module.exports = (ctx) => ({
               "message": "We’re using Vanilla CSS with PostCSS and our current configuration doesn’t allow nesting selectors as in LESS or SASS."
             , "severity": "error"
           }]
-          , "string-quotes": "double"
-          , "declaration-bang-space-before": [ "always", {
-              "message": "Please put a space before !important as it will improve readability."
-          }]
-          , "block-closing-brace-newline-after": "always"
-          , "block-opening-brace-newline-after": "always"
-          , "selector-list-comma-newline-after": "always-multi-line"
         }
       }
     }),