revert package.json

Author: Danny Diekroeger

package.json

@@ -20,7 +20,7 @@
     "bitcoinjs-message": "^2.0.0",
     "bitgo-utxo-lib": "^1.1.2",
     "body-parser": "^1.18.3",
-    "dotenv": "^6.2.0",
+    "dotenv": "^6.1.0",
     "ethereumjs-tx": "^1.3.7",
     "express": "^4.16.3",
     "jsrender": "^0.9.90",