Fix runtime-spec repository reference in README

Signed-off-by: Jonathan Boulle <[email protected]>

Author: jonboulle

README.md

@@ -6,7 +6,7 @@
 
 ## Releases
 
-`runc` depends on and tracks the [specs](https://github.com/opencontainers/runtime-spec) repository.
+`runc` depends on and tracks the [runtime-spec](https://github.com/opencontainers/runtime-spec) repository.
 We will try to make sure that `runc` and the OCI specification major versions stay in lockstep.
 This means that `runc` 1.0.0 should implement the 1.0 version of the specification.