Update Tallycoin Connect to v1.7.2 (#606)

docs/tallycoin-connect.md

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+# Tallycoin Connect
+
+Set up [Tallycoin Connect](https://github.com/djbooth007/tallycoin_connect) on your BTCPay Server instance to allow for the retrieval of Lightning invoices via [Tallycoin](https://tallyco.in/).
+LND required.
+
+## Installation
+
+To install the Tallycoin Connect service, you need to set your Tallycoin API key and a password first.
+The password is optional, but as the service will be publicly available, you are strongly advised to require a secure password for the login.
+
+You can either set `TALLYCOIN_PASSWD_CLEARTEXT` (plain text) or `TALLYCOIN_PASSWD`, which must be a sha256 hash of your login password.
+
+```bash
+# Set API key and password
+export TALLYCOIN_APIKEY="my-tallycoin-api-key"
+export TALLYCOIN_PASSWD_CLEARTEXT="sUpErSeCuRe"
+
+# Add fragment and run setup
+BTCPAYGEN_ADDITIONAL_FRAGMENTS="$BTCPAYGEN_ADDITIONAL_FRAGMENTS;opt-add-tallycoin-connect"
+. btcpay-setup.sh -i
+```
+
+Afterwards you should see Tallycoin Connect appear as a service on the Server Settings > Services page in BTCPay Server.
+
+## Troubleshooting
+
+To see the logs of the Tallycoin Connect service, you can run this command:
+
+```bash
+docker logs -f generated_tallycoin_connect_1
+```