doc: update README

Merge pull request #55 from dan-da/53_php_8_pr

v0.5.0

feat: php8 support

Merge pull request #32 from Zwilla/patch-1

New website and name author

Merge pull request #31 from sisou/php74-deprecations

Fix php7.4 deprecation warnings

Merge branch 'master' of https://github.com/dan-da/hd-wallet-derive

log specialinfo status every 10 seconds instead of every 10 keys. add info summary log after all keys derived. change 'generated' to 'derived' in log messages. credit to melaxon for bringing to my attention that this area needed improvement

Merge pull request #25 from melaxon/patch-1

correct --numderive

Merge branch 'master' of https://github.com/dan-da/hd-wallet-derive

electrum_legacy --> electrum, electrum_legacy_multi --> electrum_multi, electrum --> deleted. See issue #24

Merge pull request #23 from itinance/fix-readme-for-help-coins