Update README.md
indents in citation bibtex
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```
@software{Kleinberg_rgpt3_Making_requests_2022,
-author = {Kleinberg, Bennett},
-doi = {10.5281/zenodo.7327667},
-month = {11},
-title = {{rgpt3: Making requests from R to the GPT-3 API}},
-url = {https://github.com/ben-aaron188/rgpt3},
-version = {0.3},
-year = {2022}
+ author = {Kleinberg, Bennett},
+ doi = {10.5281/zenodo.7327667},
+ month = {11},
+ title = {{rgpt3: Making requests from R to the GPT-3 API}},
+ url = {https://github.com/ben-aaron188/rgpt3},
+ version = {0.3},
+ year = {2022}
}
```