clients/horizonclient: claimable_balance only takes one parameter

[iateadonut]

What version are you using?

[email protected]

What did you do?

I was trying to get a list of claimable balances of a single asset on a single wallet.

balances, err := client.ClaimableBalances(horizonclient.ClaimableBalanceRequest{
	Claimant: "GDJCDWRAAB3LA6TT32OBOXV2UYVJEVPKMQXDLUWYH7FQ73MCTH3UNPT7",
	//Sponsor: "GDFCYDQOVJ2OEWPLEGIRQVAM3VTOQ6JDNLJTDZP5S5OGTEHM5CIWMYBH",
	Asset: "AQUA:GBNZILSTVQZ4R7IKQDGHYGY2QXL5QOFJYQMXPKWRRM5PAV7Y4M67AQUA",
})

What did you expect to see?

I expected to see the same results I would see from this url:
https://horizon.stellar.org/claimable_balances/?claimant=GDJCDWRAAB3LA6TT32OBOXV2UYVJEVPKMQXDLUWYH7FQ73MCTH3UNPT7&asset=AQUA:GBNZILSTVQZ4R7IKQDGHYGY2QXL5QOFJYQMXPKWRRM5PAV7Y4M67AQUA&limit=200

What did you see instead?

I got the error: "invalid request: too many parameters"

I think I can fix this in claimable_balance_request.go; I can make a PR, but want to make sure this isn't already being fixed already.

[iateadonut]

PR: #4248