chore(package): update dependencies

Author: greenkeeper[bot]

packages/rollup-plugin-purgecss/package.json

@@ -35,9 +35,9 @@
     "ava": "^0.25.0",
     "babel-plugin-external-helpers": "^6.22.0",
     "babel-preset-env": "^1.7.0",
-    "eslint": "^4.19.1",
-    "jest": "^22.4.4",
-    "rollup": "^0.59.2",
+    "eslint": "^5.0.1",
+    "jest": "^23.2.0",
+    "rollup": "^0.62.0",
     "rollup-plugin-babel": "^3.0.4",
     "rollup-plugin-commonjs": "^9.1.3",
     "rollup-plugin-node-resolve": "^3.3.0"