fix(package): update dotenv to version 8.1.0

Closes #40

Author: greenkeeper[bot]

package.json

@@ -36,7 +36,7 @@
     "cac": "^5.0.12",
     "chalk": "2.4.2",
     "chokidar": "^2.0.3",
-    "dotenv": "^6.0.0",
+    "dotenv": "^8.1.0",
     "find-babel-config": "^1.1.0",
     "get-port": "^4.0.0",
     "import-local-file": "^0.2.0",