chore(package): update glslify to version 7.0.0

Author: greenkeeper[bot]

package.json

@@ -68,7 +68,7 @@
     "easeljs": "^1.0.2",
     "es6-map": "^0.1.5",
     "es6-symbol": "^3.1.1",
-    "glslify": "^6.3.1",
+    "glslify": "^7.0.0",
     "html-webpack-plugin": "^3.2.0",
     "imports-loader": "^0.8.0",
     "istanbul": "^0.4.5",