Update rework-import to latest version

rework-import was using css 1.6 & myth use rework 1.0 which use css 2.0
Also reworkcss/rework#172
Close #86

Author: MoOx

package.json

@@ -35,7 +35,7 @@
     "rework-vars": "^3.0.0",
     "rework-rebeccapurple": "1.0.1",
     "write-file-stdout": "0.0.2",
-    "rework-import": "^1.1.2",
+    "rework-import": "^1.2.0",
     "is-browser": "~2.0.0"
   },
   "devDependencies": {