fix(package): update liquidjs to version 7.5.0

Closes #9

Author: greenkeeper[bot]

package.json

@@ -18,7 +18,7 @@
   "description": "gulp liquidjs static files render",
   "main": "index.js",
   "dependencies": {
-    "liquidjs": "^6.1.0",
+    "liquidjs": "^7.5.0",
     "plugin-error": "^1.0.0",
     "through2": "^2.0.3"
   },