docs: update README.rst

Author: computationalcore

README.rst

@@ -1,8 +1,8 @@
 Cryptosteganography
 ===================
 
-.. image:: https://github.com/computationalcore/cryptosteganography/actions/workflows/build.yml/badge.svg?branch=main
-   :target: https://github.com/computationalcore/cryptosteganography/actions/workflows/build.yml
+.. image:: https://github.com/computationalcore/cryptosteganography/actions/workflows/ci.yml/badge.svg?branch=main
+   :target: https://github.com/computationalcore/cryptosteganography/actions/workflows/ci.yml
 
 .. image:: https://codecov.io/github/computationalcore/cryptosteganography/coverage.svg?branch=main
    :target: https://codecov.io/gh/computationalcore/cryptosteganography
@@ -235,4 +235,4 @@ Acknowledgments
 ---------------
 
 - `PyCryptodome <https://github.com/Legrandin/pycryptodome>`_
-- `Stéganô <https://github.com/cedricbonhomme/Stegano>`_
+- `Stéganô <https://github.com/cedricbonhomme/Stegano>`_