should not download chromium by default

[lijiarui]

We had solo all puppet right now, and use wechat4u as default puppet. While when I npm install wechaty, it will download chromium default, maybe we should not download chromium at this period.

➜  test npm install wechaty

> node-expat@2.3.16 install /Users/jiaruili/git/test/node_modules/node-expat
> node-gyp rebuild

  CC(target) Release/obj.target/expat/deps/libexpat/lib/xmlparse.o
  CC(target) Release/obj.target/expat/deps/libexpat/lib/xmltok.o
  CC(target) Release/obj.target/expat/deps/libexpat/lib/xmlrole.o
  LIBTOOL-STATIC Release/libexpat.a
  CXX(target) Release/obj.target/node_expat/node-expat.o
  SOLINK_MODULE(target) Release/node_expat.node

> leveldown@4.0.1 install /Users/jiaruili/git/test/node_modules/leveldown
> prebuild-install || node-gyp rebuild


> puppeteer@1.5.0 install /Users/jiaruili/git/test/node_modules/puppeteer
> node install.js

ERROR: Failed to download Chromium r564778! Set "PUPPETEER_SKIP_CHROMIUM_DOWNLOAD" env variable to skip download.
{ Error: read ETIMEDOUT
    at _errnoException (util.js:999:13)
    at TLSWrap.onread (net.js:629:25) errno: 'ETIMEDOUT', code: 'ETIMEDOUT', syscall: 'read' }
npm WARN test@1.0.0 No description
npm WARN test@1.0.0 No repository field.

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! puppeteer@1.5.0 install: `node install.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the puppeteer@1.5.0 install script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/jiaruili/.npm/_logs/2018-07-07T07_13_49_473Z-debug.log

[huan]

What's wechaty version had you installed?

[lijiarui]

package.json shows ^0.16.5

This is the default version when I use npm install wechaty without any command.

We should let this command using a wechaty without install chromium

[huan]

I ask you is not for the answer because I had already known that when I ask.

I ask you this question is because I want you to think about that.

Close this issue because it's not a problem.