Console log from Inferno tool chain

[wdhongtw]

Is your feature request related to a problem? Please describe.

There is always a line Inferno is in development mode., whenever running a hexo command.

npm run build

> hexo-site@0.0.0 build
> hexo generate

INFO  Validating config
Inferno is in development mode.     <----------- This line
INFO  =======================================
 ██╗ ██████╗ █████╗ ██████╗ ██╗   ██╗███████╗
 ██║██╔════╝██╔══██╗██╔══██╗██║   ██║██╔════╝
 ██║██║     ███████║██████╔╝██║   ██║███████╗
 ██║██║     ██╔══██║██╔══██╗██║   ██║╚════██║
 ██║╚██████╗██║  ██║██║  ██║╚██████╔╝███████║
 ╚═╝ ╚═════╝╚═╝  ╚═╝╚═╝  ╚═╝ ╚═════╝ ╚══════╝
=============================================
INFO  === Checking package dependencies ===
INFO  === Checking theme configurations ===

There is nothing wrong regarding the functionality.
It's just a little annoying, since that Inferno should be a transparent dependency for the users
relying on this hexo theme. :D

Describe the solution you'd like

Maybe we can adjust the config SKIP_INFERNO_WARNINGS when calling the utilities from Inferno.

Describe alternatives you've considered

We can also require users to set NODE_ENV=production by theirselves
But personally I thought the default behavior should be turning this log off for users.

Additional context

Related upstream thread: infernojs/inferno#1573