fix(multiple-arbitrable-transaction): fix #196

Author: 0xferit

contracts/standard/arbitration/MultipleArbitrableTransaction.sol

@@ -66,7 +66,7 @@ contract MultipleArbitrableTransaction {
      *  @param _party The address of the party submiting the evidence. Note that 0 is kept for evidences not submitted by any party.
      *  @param _evidence A link to evidence or if it is short the evidence itself. Can be web link ("http://X"), IPFS ("ipfs:/X") or another storing service (using the URI, see https://en.wikipedia.org/wiki/Uniform_Resource_Identifier ). One usecase of short evidence is to include the hash of the plain English contract.
      */
-    event Evidence(Arbitrator indexed _arbitrator, uint indexed _disputeID, address _party, string _evidence);
+    event Evidence(Arbitrator indexed _arbitrator, uint indexed _disputeID, address indexed _party, string _evidence);
 
     /** @dev To be emmited when a dispute is created to link the correct meta-evidence to the disputeID.
      *  @param _arbitrator The arbitrator of the contract.