Task 'kotest' not found in root project

[pacu]

When running ./gradlew kotest as specified in the plugin's README.md the command fails.

 zcash-kotlin-payment-uri % ./gradlew kotest 

FAILURE: Build failed with an exception.

* What went wrong:
Task 'kotest' not found in root project 'zcash-kotlin-payment-uri' and its subprojects. Some candidates are: 'test'.

how to reproduce:

1. go to: https://github.com/pacu/zcash-kotlin-payment-uri/
2. clone repo using commit 5122b609f141693bd69091b2f93211eb5d56a50d
3. run ./gradlew kotest