TT-RSS don't supourt gb2312 encoding feed

Describe the problem you’re having:

Tiny Tiny RSS don’t supourt gb2312 encoding feed.

If possible include steps to reproduce the problem:

Feed url: http ://www[dot]netnoease[dot]com/rss2.php

  1. Add this feed to tt-rss
  2. You will see
[Unknown]: LibXML error 6003 at line 0 (column 0): input conversion failed due to input error, bytes 0xC1 0x5F 0xC0 0xB4 

tt-rss version (including git commit id):
3827e5b94471653a459e1caeeb909abe2e3597f7

Platform (i.e. Linux distro, PHP, PostgreSQL, etc) versions:
Debian 9.7, PHP 7.0.33,psql (PostgreSQL) 9.6.10

Please provide any additional information below:
image

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