add watchSendSiacoin saga to middleware
add watchSendSiacoin saga to middleware

rivine/rivine-UI,rivine/rivine-UI,NebulousLabs/New-Sia-UI,NebulousLabs/New-Sia-UI,rivine/rivine-UI,NebulousLabs/New-Sia-UI,NebulousLabs/Sia-UI,NebulousLabs/Sia-UI,NebulousLabs/Sia-UI