Upgrade httpoison & hackney because of duplicated headers #7
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I have a problem with committing documents:
400 23 org.apache.solr.common.SolrException javax.xml.stream.XMLStreamException [unsupported encoding]: java.io.UnsupportedEncodingException: UTF-8, text/xml; charset=utf-8 400 ` I checked what is sent: `nc -lv 127.0.0.1 8984 POST /solr/elixir_blog_core/update HTTP/1.1 Content-Type: text/xml; charset=utf-8, text/xml; charset=utf-8 User-Agent: hackney/1.6.6 Host: 127.0.0.1:8984 Content-Length: 9`
`
Then found the bug in hackney 1.6.6 (duplicated headers), which was fixed in 1.7.0 (benoitc/hackney#388) - so I forked and used httpoison version which uses this version.
If you want you can apply this change if the project is still maintained.