add testnet support to decoder
add testnet support to decoder

OmniLayer/omniwallet,OmniLayer/omniwallet,habibmasuro/omniwallet,OmniLayer/omniwallet,Nevtep/omniwallet,achamely/omniwallet,habibmasuro/omniwallet,Nevtep/omniwallet,achamely/omniwallet,habibmasuro/omniwallet,habibmasuro/omniwallet,Nevtep/omniwallet,achamely/omniwallet,OmniLayer/omniwallet,Nevtep/omniwallet,achamely/omniwallet