build: osx readme: note cli xcode needs to be deleted before install
build: osx readme: note cli xcode needs to be deleted before install

upgrading an existing directory does not seem to work well

spesmilo/electrum,spesmilo/electrum,spesmilo/electrum,pooler/electrum-ltc,spesmilo/electrum,pooler/electrum-ltc,pooler/electrum-ltc,pooler/electrum-ltc