fix broken links lukas-blecher#45

Author: lukas-blecher

README.md

@@ -61,7 +61,7 @@ The model consist of a ViT [[1](#References)] encoder with a ResNet backbone and
 | 0.88       | 0.10                 |
 
 ## Data
-We need paired data for the network to learn. Luckily there is a lot of LaTeX code on the internet, e.g. [wikipedia](www.wikipedia.org), [arXiv](www.arxiv.org). We also use the formulae from the [im2latex-100k](https://zenodo.org/record/56198#.V2px0jXT6eA) dataset.
+We need paired data for the network to learn. Luckily there is a lot of LaTeX code on the internet, e.g. [wikipedia](https://www.wikipedia.org), [arXiv](https://www.arxiv.org). We also use the formulae from the [im2latex-100k](https://zenodo.org/record/56198#.V2px0jXT6eA) dataset.
 All of it can be found [here](https://drive.google.com/drive/folders/13CA4vAmOmD_I_dSbvLp-Lf0s6KiaNfuO)
 
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