instanbul -> nyc, and fix the old travis integration

Author: raydog

.travis.yml

@@ -1,7 +1,9 @@
+os:
+  - linux
+  - osx
 language: node_js
 node_js:
   - "node"
-  - "6"
-  - "4"
+  - "lts/*"
 after_success:
   - "npm run coveralls"

README.md

@@ -1,8 +1,8 @@
 # adventure.js
 
-[![Build Status](https://travis-ci.org/raydog/adventure.js.svg?branch=master)](https://travis-ci.org/raydog/adventure.js) [![Coverage Status](https://coveralls.io/repos/github/raydog/adventure.js/badge.svg?branch=master)](https://coveralls.io/github/raydog/adventure.js?branch=master) [![NPM Version](https://img.shields.io/npm/v/adventurejs.svg)](https://www.npmjs.com/package/adventurejs)
+[![Build Status](https://travis-ci.com/raydog/adventure.js.svg?branch=master)](https://travis-ci.com/raydog/adventure.js) [![Coverage Status](https://coveralls.io/repos/github/raydog/adventure.js/badge.svg?branch=master)](https://coveralls.io/github/raydog/adventure.js?branch=master) [![NPM Version](https://img.shields.io/npm/v/adventurejs.svg)](https://www.npmjs.com/package/adventurejs)
 
-A javascript port of the 350-point version of the classic Adventure game. I originally wrote this code as part of a Slackbot, where people could play the game by PM-ing the bot. I broke the code out of the original project so it could be reused and, well, here we are.
+A javascript port of the 350-point version of the classic Adventure game. I originally wrote this code as part of a Slackbot, where people could play the game by DM-ing the bot. I broke the code out of the original project so it could be reused and, well, here we are.
 
 ## Playing the game
 

package.json

@@ -22,12 +22,12 @@
     "coveralls": "3.1.0",
     "eslint": "7.27.0",
     "mocha": "8.4.0",
-    "istanbul": "0.4.5"
+    "nyc": "15.1.0"
   },
   "scripts": {
-    "coverage": "istanbul cover _mocha -- test",
-    "coveralls": "istanbul cover _mocha --report lcovonly -- test && cat ./coverage/lcov.info | coveralls",
-    "test": "mocha test"
+    "test": "mocha",
+    "coverage": "nyc npm test",
+    "coveralls": "npm run coverage && nyc report --reporter=text-lcov | coveralls"
   },
   "author": "Ray Myers",
   "license": "MIT"