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

Author: maxbeatty

.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"
 

package-lock.json

@@ -8,7 +8,9 @@
     "lint": "standard",
     "postlint": "standard-markdown",
     "pretest": "npm run lint",
-    "test": "tap tests/*.js --100"
+    "test": "tap tests/*.js --100",
+    "prerelease": "npm test",
+    "release": "standard-version --sign"
   },
   "repository": {
     "type": "git",
@@ -27,15 +29,16 @@
   "license": "BSD-2-Clause",
   "devDependencies": {
     "decache": "^4.5.1",
-    "flow-bin": "^0.92.1",
-    "sinon": "^7.2.3",
+    "flow-bin": "^0.98.0",
+    "sinon": "^7.3.2",
     "standard": "^12.0.1",
     "standard-markdown": "^5.0.1",
-    "tap": "^12.5.1"
+    "standard-version": "^5.0.2",
+    "tap": "^13.1.2"
   },
   "dependencies": {},
   "engines": {
-    "node": ">=6"
+    "node": ">=8"
   },
   "standard": {
     "ignore": [