Akilan_19

regex added for Senegal sn-SN

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### Validations added for Senegal - Issue https://github.com/validatorjs/validator.js/issues/1761 - isMobilePhone regex added for 'sn-SN'. Reference -[Telephone_numbers_in_Senegal](https://en.wikipedia.org/wiki/Telephone_numbers_in_Senegal) - isPostalCode regex added for 'SN'. Reference - Relevant unit test added & Readme...

Adding new Data Visualizing tools

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**We can add tools like Power BI and Tableau under data visualization section.** These are the tools essential to showcase data visualization skills, these are very essential for a **data...