ionic platform add error caused by CONFIG_FILE (windows host)

[marcionicolau]

This issue is related with ionic-team/ionic-cli#1696 and probably caused by missing slash in CONFIG_FILE.

See below the backtrace:

Unable to parse Ionic Config file. Please make sure it is valid JSON (.ionic/ionic.config)
Caught exception:
SyntaxError: Unexpected token in JSON at position 0
at Object.parse (native)
at Object.load (C:\Users<user>\AppData\Roaming\npm\node_modules\ionic\node_modules\ionic-app-lib\lib\config.js:14:26
)
at Object. (C:\Users<user>\AppData\Roaming\npm\node_modules\ionic\lib\utils\stats.js:31:31)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.require (module.js:497:17)
at require (internal/module.js:20:19)

Changes in file config.js: CONFIG_FILE: '.ionic/ionic.config' =>CONFIG_FILE: './ionic/ionic.config',