bibtex cleanup

small script to edit Bibtex files

README.md

-Latex Tips and Tricks
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+Latex Tips and Tricks
+
+### Clean up .bib files
+
+Use the `bibtex-improver.py` script to remove duplicate titles and unwanted fields (Doi, ISBN, Keywords, bdsk-url-1). The script will update the original bibliography file. 
+
+*Note: If you want to keep original bib-file, make a copy before using the script.*
+
+Install the [BibtexParser](https://bibtexparser.readthedocs.io/en/latest/index.html) Python package:
+```
+pip3 install bibtexparser
+```
+
+Usage:
+```
+python3 bibtex-improver.py bibfilepath
+```
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