doc: update readme

Signed-off-by: Zone.N <zone.niuzh@hotmail.com>

Author: MRNIU

README.md

@@ -214,7 +214,7 @@ make run
 
 [google/googletest](https://github.com/google/googletest.git)
 
-[eyalroz/printf](https://github.com/eyalroz/printf.git)
+[charlesnicholson/nanoprintf](https://github.com/charlesnicholson/nanoprintf.git)
 
 [MRNIU/cpu_io](https://github.com/MRNIU/cpu_io.git)
 

README_ENG.md

@@ -153,7 +153,7 @@ See New Features
 
 [google/googletest](https://github.com/google/googletest.git)
 
-[eyalroz/printf](https://github.com/eyalroz/printf.git)
+[charlesnicholson/nanoprintf](https://github.com/charlesnicholson/nanoprintf.git)
 
 [MRNIU/cpu_io](https://github.com/MRNIU/cpu_io.git)