Installation bug

[hapo-hoangnh]

our requirements could not be resolved to an installable set of packages.
laravel 5.8
php 7.1
carbon v2

 Problem 1
    - spatie/laravel-feed 2.1.0 requires illuminate/support ~5.5.0|~5.6.0 -> found illuminate/support[v5.5.0, ..., 5.6.x-dev] but these were not loaded, likely because it conflicts with another require.
    - spatie/laravel-feed 2.1.1 requires laravel/framework ~5.5.0|~5.6.0|~5.7.0 -> found laravel/framework[v5.5.0, ..., 5.7.x-dev] but it conflicts with your root composer.json require (^5.8.0).
    - spatie/laravel-feed 2.1.2 requires nesbot/carbon ^1.0 -> found nesbot/carbon[1.0.0, ..., 1.39.1] but the package is fixed to 2.32.1 (lock file version) by a partial update and that version does not match. Make sure you list it as an argument for the update command.
    - spatie/laravel-feed[2.2.0, ..., 2.7.0] require php ^7.2 -> your php version (7.1.33) does not satisfy that requirement.
    - spatie/laravel-feed 2.7.1 requires php ^7.3 -> your php version (7.1.33) does not satisfy that requirement.
    - Root composer.json requires spatie/laravel-feed ^2.1 -> satisfiable by spatie/laravel-feed[2.1.0, ..., 2.7.1].

Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.