Update README with badge link.

Author: cheatfate

README.md

@@ -1,5 +1,5 @@
 # nimcrypto
-[![Github action](https://github.com/cheatfate/nimcrypto/workflows/nimcrypto/badge.svg)](https://github.com/cheatfate/nimcrypto/actions/workflows/ci.yml)
+[![Github action](https://github.com/cheatfate/nimcrypto/workflows/nimcrypto/badge.svg?branch=master)](https://github.com/cheatfate/nimcrypto/actions/workflows/ci.yml)
 
 # Nim cryptographic library
 
@@ -22,4 +22,4 @@ echo keccak_256.digest("Alice makes a hash")
 # outputs F8AE86DA35CF3D9F0816BAA6015A6AFFD20BA5D6A533FEA94D89D6164264326F
 ```
 
-See full documentation [here](https://cheatfate.github.io/nimcrypto).
+See full documentation [here](https://cheatfate.github.io/nimcrypto).