Drop support for Node v6 (#392)

* chore: node 6 eol

* chore: upgrade dependencies

* style: adopt conventional commits

BREAKING CHANGE: dropping Node v6 support because end-of-life

.travis.yml

@@ -7,16 +7,16 @@ os:
   - windows
 
 node_js:
-  - "6"
   - "8"
   - "10"
   - "11"
+  - "12"
 
 cache: npm
 
 matrix:
   fast_finish: true
   allow_failures:
-  - os: windows
+    - os: windows
 
 after_success: if [[ "$TRAVIS_OS_NAME" != 'windows' ]]; then npm run flow; fi

README.md

@@ -10,6 +10,7 @@ Dotenv is a zero-dependency module that loads environment variables from a `.env
 [![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat-square)](https://github.com/feross/standard)
 [![Coverage Status](https://img.shields.io/coveralls/motdotla/dotenv/master.svg?style=flat-square)](https://coveralls.io/github/motdotla/dotenv?branch=coverall-intergration)
 [![LICENSE](https://img.shields.io/github/license/motdotla/dotenv.svg)](LICENSE)
+[![Conventional Commits](https://img.shields.io/badge/Conventional%20Commits-1.0.0-yellow.svg)](https://conventionalcommits.org)
 
 ## Install
 

appveyor.yml

@@ -3,7 +3,6 @@
 # Test against these versions of Node.js.
 environment:
   matrix:
-    - nodejs_version: "6"
     - nodejs_version: "8"
     - nodejs_version: "10"