Update README.md

README.md

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 # NewsBERT
 
-**NewsBERT** is a domain-adapted masked language model based on [`google-bert/bert-base-uncased`](https://huggingface.co/google-bert/bert-base-uncased). It has been fine-tuned with a **masked language modeling (MLM)** objective on all **historical English newspaper text** from the following two collections:
+**NewsBERT** is a domain-adapted masked language model based on [`google-bert/bert-base-uncased`](https://huggingface.co/google-bert/bert-base-uncased). It has been fine-tuned with a **masked language modeling (MLM)** objective on all **historical English newspaper text** (1800-1920) from the following two collections:
 - [HMD14](https://bl.iro.bl.uk/concern/datasets/2800eb7d-8b49-4398-a6e9-c2c5692a1304)
 - [LwM](https://bl.iro.bl.uk/concern/datasets/99dc570a-9460-48ac-baed-9d2b8c4c13c0?locale=en)