readme: fix link to TensorBoard

README.md

@@ -24,7 +24,7 @@ We use XLM-RoBERTa Large as backbone language model and the following hyper-para
 | Learning Rate   | `5-06` |
 | Max. Epochs     | `10`   |
 
-Additionally, the [FLERT](https://arxiv.org/abs/2011.06993) approach is used for fine-tuning the model. [Training logs](training.log) and [TensorBoard]() are also available for each model.
+Additionally, the [FLERT](https://arxiv.org/abs/2011.06993) approach is used for fine-tuning the model. [Training logs](training.log) and [TensorBoard](../../tensorboard) are also available for each model.
 
 ## Results