message: gets ReplaceKeysApplyTest working
diff: @@ -27,7 +27,7 @@ namespace Hyperledger.Indy.Test.SignusTests
  [TestMethod]
  public async Task TestReplaceKeysApplyWorksWithoutCallingReplaceStart()
  {
  - var ex = await Assert.ThrowsExceptionAsync<WalletValueNotFoundException>(() =>
  + var ex = await Assert.ThrowsExceptionAsync<WalletItemNotFoundException>(() =>
  Did.ReplaceKeysApplyAsync(wallet, _did)
  );
  }
  @@ -37,7 +37,7 @@ namespace Hyperledger.Indy.Test.SignusTests
  {
  await Did.ReplaceKeysStartAsync(wallet, _did, "{}");
  - var ex = await Assert.ThrowsExceptionAsync<WalletValueNotFoundException>(() =>
  + var ex = await Assert.ThrowsExceptionAsync<WalletItemNotFoundException>(() =>
  Did.ReplaceKeysApplyAsync(wallet, DID1)
  );
  }
  