You are required to install the **Blinker** library
from https://github.com/blinker-iot/blinker-library
Or
You are required to install the **[Blinker](https://github.com/blinker-iot/blinker-library)** library.
You are required to install the **[Blinker]** library.
+
[Blinker]: https://github.com/blinker-iot/blinker-library