Fixed tag link.

Author: mluis1

README.md

@@ -22,7 +22,7 @@ This project has 2 active branches in place.
 
 | Branch        | L2 spec       | RP spec   | Tag/Milestone       | Class     | Comments      |
 | ------------- |:-------------:|:---------:|:---------:|:---------:|:--------------|
-| [master](https://github.com/Lora-net/LoRaMac-node/tree/master) | [1.0.3](https://lora-alliance.org/resource-hub/lorawantm-specification-v103) | [v1.0.3revA](https://www.lora-alliance.org/resource-hub/lorawantm-regional-parameters-v103reva) | [v4.4.4](https://github.com/Lora-net/LoRaMac-node/releases/tag/v4.4.4) | A/B/C | Released |
+| [master](https://github.com/Lora-net/LoRaMac-node/tree/master) | [1.0.3](https://lora-alliance.org/resource-hub/lorawantm-specification-v103) | [v1.0.3revA](https://www.lora-alliance.org/resource-hub/lorawantm-regional-parameters-v103reva) | [v4.4.4](https://github.com/Lora-net/LoRaMac-node/releases/tag/4.4.4) | A/B/C | Released |
 | [develop](https://github.com/Lora-net/LoRaMac-node/tree/develop) | [1.0.4](https://lora-alliance.org/resource-hub) / [1.1.1](https://lora-alliance.org/resource-hub/lorawantm-specification-v11) | [2-1.0.1](https://lora-alliance.org/sites/default/files/2020-02/rp_2-1.0.1.pdf) | [M 5.0.0](https://github.com/Lora-net/LoRaMac-node/milestone/3) | A/B/C |  LoRaWAN L2 1.0.4 / 1.1.1 |
 
 This project fully implements ClassA, ClassB and ClassC end-device classes and it also provides SX1272/73, SX1276/77/78/79, SX1261/2 and LR1110 radio drivers.