Update plugin-error to version 1.0.0 (#35)

Author: greenkeeper[bot]

package.json

@@ -29,7 +29,7 @@
   "dependencies": {
     "lesshint": "^4.0.0",
     "lesshint-reporter-stylish": "^2.0.0",
-    "plugin-error": "^0.1.2",
+    "plugin-error": "^1.0.0",
     "through2": "^2.0.0"
   },
   "devDependencies": {