feat: load .nycrc/.nycrc.json to simplify migration (#100)

Author: Benjamin E. Coe

lib/parse-args.js

@@ -4,7 +4,7 @@ const { readFileSync } = require('fs')
 const Yargs = require('yargs/yargs')
 const parser = require('yargs-parser')
 
-const configPath = findUp.sync(['.c8rc', '.c8rc.json'])
+const configPath = findUp.sync(['.c8rc', '.c8rc.json', '.nycrc', `.nycrc.json`])
 const config = configPath ? JSON.parse(readFileSync(configPath)) : {}
 
 function buildYargs (withCommands = false) {