fix(package): update known-css-properties to version 0.6.1 (#53)

Closes #52

Author: gucong3000

package.json

@@ -5,7 +5,7 @@
   },
   "dependencies": {
     "autoprefixer": "^7.2.5",
-    "known-css-properties": "^0.5.0",
+    "known-css-properties": "^0.6.1",
     "normalize-range": "^0.1.2",
     "postcss": "^6.0.16",
     "postcss-selector-parser": "^3.1.1",