README.md: format table as raw text

README.md

@@ -27,6 +27,7 @@ The directory `transformer_models/` contains a pretrained model, [electra-base-i
 
 The parser scores as follows:
 
+```
 Metric     | Precision |    Recall |  F1 Score | AligndAcc
 -----------+-----------+-----------+-----------+-----------
 Tokens     |     99.70 |     99.77 |     99.73 |
@@ -35,6 +36,7 @@ Words      |     99.62 |     99.61 |     99.61 |
 UAS        |     89.58 |     89.57 |     89.58 |     89.92
 LAS        |     86.46 |     86.45 |     86.46 |     86.79
 CLAS       |     82.30 |     81.81 |     82.05 |     82.24
+```
 
 ## License
 https://opensource.org/licenses/Apache-2.0