requirements: use PyQt <5.12 in binaries for now. for AppImage
requirements: use PyQt <5.12 in binaries for now. for AppImage

AppImage is built on Ubuntu 14.04 to maximise compatibility
but PyQt 5.12 blobs distributed on PyPI no longer work on 14.04
PyQt 5.11.x works

neocogent/electrum,wakiyamap/electrum-mona,wakiyamap/electrum-mona,vialectrum/vialectrum,fujicoin/electrum-fjc,spesmilo/electrum,wakiyamap/electrum-mona,fujicoin/electrum-fjc,wakiyamap/electrum-mona,spesmilo/electrum,neocogent/electrum,pooler/electrum-ltc,pooler/electrum-ltc,neocogent/electrum,pooler/electrum-ltc,spesmilo/electrum,vialectrum/vialectrum,vialectrum/vialectrum,spesmilo/electrum,pooler/electrum-ltc,fujicoin/electrum-fjc