Fix broken README link (#36)

Author: Javagedes

README.md

@@ -3,7 +3,7 @@
 [![release]][_release]
 [![commit]][_commit]
 [![ci]][_ci]
-[![codecov]][_codecov]
+[![cov]][_cov]
 
 MTRR(Memory Type Range Registers) Lib helps program MTRRs on x86_64
 architecture.
@@ -127,5 +127,5 @@ fn mtrr_lib_usage() {
 [_commit]: https://github.com/OpenDevicePartnership/patina-mtrr/commits/main/
 [ci]: https://github.com/OpenDevicePartnership/patina-mtrr/actions/workflows/ci-workflow.yml/badge.svg?branch=main&event=push
 [_ci]: https://github.com/OpenDevicePartnership/patina-mtrr/actions/workflows/ci-workflow.yml
-[codcov]: https://codecov.io/github/OpenDevicePartnership/patina-mtrr/graph/badge.svg?token=TUG4C3PK84
-[_codecov]: https://codecov.io/github/OpenDevicePartnership/patina-mtrr
+[cov]: https://codecov.io/github/OpenDevicePartnership/patina-mtrr/graph/badge.svg?token=TUG4C3PK84
+[_cov]: https://codecov.io/github/OpenDevicePartnership/patina-mtrr