Update dotenv to the latest version 🚀 (#11)

* fix(package): update dotenv to version 7.0.0

* chore(package): update lockfile yarn.lock

Author: greenkeeper[bot]

package.json

@@ -15,7 +15,7 @@
     "bunyan-format": "^0.2.1",
     "commander": "2.19.0",
     "css-tree": "1.0.0-alpha25",
-    "dotenv": "^6.2.0",
+    "dotenv": "^7.0.0",
     "puppeteer": "^1.12.2",
     "sizzle": "2.3.3",
     "source-map": "0.7.3"

yarn.lock

@@ -1141,10 +1141,10 @@ domexception@^1.0.1:
   dependencies:
     webidl-conversions "^4.0.2"
 
-dotenv@^6.2.0:
-  version "6.2.0"
-  resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-6.2.0.tgz#941c0410535d942c8becf28d3f357dbd9d476064"
-  integrity sha512-HygQCKUBSFl8wKQZBSemMywRWcEDNidvNbjGVyZu3nbZ8qq9ubiPoGLMdRDpfSrpkkm9BXYFkpKxxFX38o/76w==
+dotenv@^7.0.0:
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-7.0.0.tgz#a2be3cd52736673206e8a85fb5210eea29628e7c"
+  integrity sha512-M3NhsLbV1i6HuGzBUH8vXrtxOk+tWmzWKDMbAVSUp3Zsjm7ywFeuwrUXhmhQyRK1q5B5GGy7hcXPbj3bnfZg2g==
 
 dtrace-provider@~0.8:
   version "0.8.7"