remove PaymentSplitter

.changeset/clever-eagles-unite.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': major
+---
+
+`PaymentSplitter`: removed.

contracts/finance/README.adoc

@@ -5,16 +5,10 @@ NOTE: This document is better viewed at https://docs.openzeppelin.com/contracts/
 
 This directory includes primitives for financial systems:
 
-- {PaymentSplitter} allows to split Ether and ERC20 payments among a group of accounts. The sender does not need to be
-  aware that the assets will be split in this way, since it is handled transparently by the contract. The split can be
-  in equal parts or in any other arbitrary proportion.
-
 - {VestingWallet} handles the vesting of Ether and ERC20 tokens for a given beneficiary. Custody of multiple tokens can
   be given to this contract, which will release the token to the beneficiary following a given, customizable, vesting
   schedule.
 
 == Contracts
 
-{{PaymentSplitter}}
-
 {{VestingWallet}}