Support node.js 10

[sbor23]

yarn fails with node.js 10.15.1.

yarn install v1.13.0
[1/5] Validating package.json...
[2/5] Resolving packages...
[3/5] Fetching packages...
error broccoli-postcss@3.5.0: The engine "node" is incompatible with this module. Expected version "^4.5 || ^6 || ^7 || ^8". Got "10.15.1"

Maybe put the supported versions in the Readme or make the project ready for double-digits?

[fkm]

Seems to be a lock-file issue.

The dependency in the package.json is already correct.
"ember-cli-postcss": "^4.0.0",

ember-cli-postcss@^4.0.0:
  version "4.0.0"
  resolved "https://registry.yarnpkg.com/ember-cli-postcss/-/ember-cli-postcss-4.0.0.tgz#d32c4ab5539122e3bc8fe26bb9cc18d8ac377739"
  dependencies:
    broccoli-file-creator "^2.1.1"
    broccoli-merge-trees "^3.0.0"
    broccoli-postcss "^3.5.3"
    broccoli-postcss-single "^1.6.0"
    ember-cli-babel "^6.12.0"
    merge "^1.2.0"

broccoli-postcss "^3.5.3"

I tried manually cleaning up the yarn.lock file but to no avail.

[fkm]

Thanks to @velrest we found the culprit:

ember-adcssy@^1.2.1:
  version "1.2.1"
  resolved "https://registry.yarnpkg.com/ember-adcssy/-/ember-adcssy-1.2.1.tgz#7b6d2a1f9cb43434ddf5c6e5e1614458849965d1"
  dependencies:
    adcssy "^0.10.0"
    broccoli-funnel "^0.2.8"
    broccoli-merge-trees "^0.2.3"
    ember-cli-postcss "^3.5.2"
    font-awesome "^4.7.0"
    postcss-cssnext "^3.0.2"
    postcss-import "^11.0.0"
    postcss-responsive-type "^1.0.0"

[sbor23]

This is resolved