Update README.md

Author: victorsanchezarevalo

README.md

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 # pymportx
-`pymportx` is a Python package designed for fast gene count estimation using transcript quantification files generated by pseudoalignment or quasi-mapping tools. It is a Python adaptation of the widely-used [tximport](https://bioconductor.org/packages/release/bioc/html/tximport.html) R package from Bioconductor.
+`pymportx` is a Python package designed for fast gene count estimation using transcript quantification files generated by pseudoalignment or quasi-mapping tools. It is a Python adaptation of the widely-used [`tximport`](https://bioconductor.org/packages/release/bioc/html/tximport.html) R package from Bioconductor.
 
 ## Example
 ```python