Litecoin: bump version to 2.5.1.1
Litecoin: bump version to 2.5.1.1

pknight007/electrum-vtc,pooler/electrum-ltc,pooler/electrum-ltc,pknight007/electrum-vtc,pooler/electrum-ltc,vertcoin/electrum-vtc,vertcoin/electrum-vtc,pknight007/electrum-vtc,pooler/electrum-ltc,vialectrum/vialectrum,vialectrum/vialectrum,pknight007/electrum-vtc,vialectrum/vialectrum,vertcoin/electrum-vtc,vertcoin/electrum-vtc