Update README.md

SciCrunch · Aug 27, 2020 · 2a31134 · 2a31134
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 # paperpdf2xml
 
-A set of Python CLI to convert scientific papers in PDF format to  XML documents with sections and tables. 
+A set of Python 3 CLI to convert scientific papers in PDF format to  XML documents with sections and tables. 
 
 ## Prerequisites
 
-* Make sure you have installed `pdftottext` utility installed for initial PDF to text conversion
+* Make sure you have installed `pdftottext` utility installed for initial PDF to text conversion.
+
 For Ubuntu/Debian
 ```
 sudo apt-get install poppler-utils
 ```
+
+For  RedHat/RHEL/ Fedora/ CentOS Linux
+```
+sudo yum install poppler-utils
+```
+
+* Install `spacy` NLP library and models
+