Update DOI and version in README

Updated DOI and version number in README.md.

Author: ss0832

README.md

@@ -9,7 +9,9 @@
 [![Buy Me A Coffee](https://img.shields.io/badge/Buy%20Me%20a%20Coffee-ffdd00?style=for-the-badge&logo=buy-me-a-coffee&logoColor=black)](https://buymeacoffee.com/ss0832)
 
 [![PyPI Downloads](https://static.pepy.tech/personalized-badge/multioptpy?period=total&units=INTERNATIONAL_SYSTEM&left_color=BLACK&right_color=GREEN&left_text=downloads)](https://pepy.tech/projects/multioptpy)
-[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.17973395.svg)](https://doi.org/10.5281/zenodo.17973395)
+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.18529521.svg)](https://doi.org/10.5281/zenodo.18529521)
+
+
 
 If this tool helped your studies, education, or saved your time, I'd appreciate a coffee!
 Your support serves as a great encouragement for this personal project and fuels my next journey.
@@ -137,11 +139,11 @@ References are given in the source code.
 After downloading the repository using git clone or similar commands, move to the generated directory and run the following:
 python command
 ```
-python optmain.py SN2.xyz -ma 150 1 6 -pyscf -elec -1 -spin 0 -opt rsirfo_block_fsb -modelhess
+python optmain.py SN2.xyz -ma 150 1 6 -pyscf -elec 0 -spin 0 -opt rsirfo_block_fsb -modelhess
 ```
 CLI command (arbitrary directory)
 ```
-optmain SN2.xyz -ma 150 1 6 -pyscf -elec 0 -spin 0 -opt rsirfo_block_fsb -modelhess
+optmain SN2.xyz -ma 150 1 6 -pyscf -elec -1 -spin 0 -opt rsirfo_block_fsb -modelhess
 ```
 python command
 ```
@@ -392,13 +394,13 @@ If you use MultiOptPy in your research, please cite it as follows:
   month        = dec,
   year         = 2025,
   publisher    = {Zenodo},
-  version      = {v1.20.4},
-  doi          = {10.5281/zenodo.17973395},
-  url          = {https://doi.org/10.5281/zenodo.17973395}
+  version      = {v1.20.8},
+  doi          = {10.5281/zenodo.18529521},
+  url          = {https://doi.org/10.5281/zenodo.18529521}
 }
 ```
 ```
-ss0832. (2025). MultiOptPy: Multifunctional geometry optimization tools for quantum chemical calculations (v1.20.4). Zenodo. https://doi.org/10.5281/zenodo.17973395
+ss0832. (2025). MultiOptPy: Multifunctional geometry optimization tools for quantum chemical calculations (v1.20.8). Zenodo. https://doi.org/10.5281/zenodo.18529521
 ```
 
 ## Setting Up an Environment for Using NNP(UMA) on Windows 11