Update dotenv to the latest version 🚀 (#16)

* fix(package): update dotenv to version 8.0.0

* chore(package): update lockfile yarn.lock

Author: greenkeeper[bot]

package.json

@@ -15,7 +15,7 @@
     "bunyan-format": "^0.2.1",
     "commander": "2.20.0",
     "css-tree": "1.0.0-alpha25",
-    "dotenv": "^7.0.0",
+    "dotenv": "^8.0.0",
     "puppeteer": "^1.12.2",
     "sizzle": "2.3.4",
     "source-map": "0.7.3"

yarn.lock

@@ -1146,10 +1146,10 @@ domexception@^1.0.1:
   dependencies:
     webidl-conversions "^4.0.2"
 
-dotenv@^7.0.0:
-  version "7.0.0"
-  resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-7.0.0.tgz#a2be3cd52736673206e8a85fb5210eea29628e7c"
-  integrity sha512-M3NhsLbV1i6HuGzBUH8vXrtxOk+tWmzWKDMbAVSUp3Zsjm7ywFeuwrUXhmhQyRK1q5B5GGy7hcXPbj3bnfZg2g==
+dotenv@^8.0.0:
+  version "8.0.0"
+  resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-8.0.0.tgz#ed310c165b4e8a97bb745b0a9d99c31bda566440"
+  integrity sha512-30xVGqjLjiUOArT4+M5q9sYdvuR4riM6yK9wMcas9Vbp6zZa+ocC9dp6QoftuhTPhFAiLK/0C5Ni2nou/Bk8lg==
 
 dtrace-provider@~0.8:
   version "0.8.7"