fix(package): update dotenv to version 8.1.0

Closes #10

Author: greenkeeper[bot]

package.json

@@ -32,7 +32,7 @@
     "bcrypt": "^3.0.2",
     "cors": "^2.8.5",
     "dataloader": "^1.4.0",
-    "dotenv": "^6.1.0",
+    "dotenv": "^8.1.0",
     "express": "^4.16.4",
     "graphql": "^14.0.2",
     "graphql-iso-date": "^3.6.1",