Update README.md

Author: Olexandr88

README.md

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 # Building Secure Smart Contracts
 
-![](https://github.com/crytic/building-secure-contracts/actions/workflows/echidna.yml/badge.svg) ![](https://github.com/crytic/building-secure-contracts/actions/workflows/medusa.yml/badge.svg)
+[![](https://github.com/crytic/building-secure-contracts/actions/workflows/echidna.yml/badge.svg)](https://github.com/crytic/building-secure-contracts/actions/workflows/echidna.yml) [![](https://github.com/crytic/building-secure-contracts/actions/workflows/medusa.yml/badge.svg)](https://github.com/crytic/building-secure-contracts/actions/workflows/medusa.yml)
 
 Brought to you by [Trail of Bits](https://www.trailofbits.com/), this repository offers guidelines and best practices for developing secure smart contracts. Contributions are welcome, you can contribute by following our [contributing guidelines](https://github.com/crytic/building-secure-contracts/blob/master/CONTRIBUTING.md).