composer.json deprecation warning and other warnings fix (composer 2)

[filbe]

composer.json proposal
Added name compability (x/x format), description, license and phpFastCache -> lowercase

{
  "name": "skeleton/skeleton",
  "type": "project",
  "description": "project",
  "license": "MIT",
  "minimum-stability": "dev",
  "prefer-stable": true,
  "config": {
    "bin-dir": "./",
    "component-dir": "web"
  },
  "repositories": [{
    "url": "https://github.com/kehikko/kernel.git",
    "type": "git"
  }],
  "require":
  {
    "twig/twig": "^2.0",
    "symfony/yaml": "^3.2",
    "phpfastcache/phpfastcache": "^4.3",
    "mtdowling/cron-expression": "^1.1",
    "pear/console_commandline": "^1.2",
    "kehikko/kernel": "1.*",
    "kehikko/core": "1.*",
    "kehikko/route-common": "^1.1"
  }
}