Update Event emit docs pragma

Event's `emit` usage was introduced in 0.4.21+
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Harry Moreno 2018-06-07 15:07:07 -04:00 committed by GitHub
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@ -742,7 +742,7 @@ All non-indexed arguments will be stored in the data part of the log.
::
pragma solidity ^0.4.0;
pragma solidity ^0.4.21;
contract ClientReceipt {
event Deposit(