fix(package): update gridsome to version 0.7.2

Closes #4

Author: greenkeeper[bot]

package.json

@@ -12,7 +12,7 @@
     "@gridsome/remark-prismjs": "^0.0.6",
     "@gridsome/source-filesystem": "^0.3.0",
     "@gridsome/transformer-remark": "^0.2.0",
-    "gridsome": "^0.5.0"
+    "gridsome": "^0.7.2"
   },
   "devDependencies": {
     "node-sass": "^4.11.0",