Fix outdated links in README.md (#772)

README.md

@@ -13,6 +13,6 @@ The following UI components are currently available -
 
 Additionally some shared libraries, that are not dependent on any framework -
 
-- [ui-keyring](packages/ui-keyring/) A browser-specific wrapper around the base [@polkadot/util-keyring](https://github.com/polkadot-js/util/) library
+- [ui-keyring](packages/ui-keyring/) A browser-specific wrapper around the base [@polkadot/keyring](https://github.com/polkadot-js/common/) library
 - [ui-settings](packages/ui-settings/) A browser local storage wrapper for app settings & configuration
 - [ui-shared](packages/ui-shared) Shared logic that is used across UI components, e.g. for icon generation

packages/ui-keyring/README.md

@@ -123,7 +123,7 @@ class MyReactComponent extends React.PureComponent<State> {
 - What are 'external' accounts, i.e. when to set the `isExternal` meta key to true?
   - An external account is one where the keys are not managed by keyring, e.g. in Parity Signer or Ledger Nano.
 - SS58 Encode / Decode?
-  -  SS58 is a simple address format designed for Substrate based chains. You can read about its specification in more detail in the [Parity Wiki](https://wiki.parity.io/External-Address-Format-(SS58)).
+  -  SS58 is a simple address format designed for Substrate based chains. You can read about its specification in more detail in the [Substrate Documentation](https://docs.substrate.io/reference/address-formats/).
 
 **If you have any unanswered/undocumented questions, please raise an issue [here](https://github.com/polkadot-js/ui/issues).**