Fix broken link (#186)

Signed-off-by: Arrobo, Gabriel <[email protected]>

Author: gab-arrobo

README.md

@@ -31,7 +31,7 @@ profile from the database and returns it to the caller.
 - Subscription management callbacks to network functions.
 - NRF cache library which can be used by modules to avoid frequent queries to NRF
 
-Compliance of the 5G Network functions can be found at [5G Compliance](https://docs.sd-core.opennetworking.org/master/overview/3gpp-compliance-5g.html)
+Compliance of the 5G Network functions can be found at [5G Compliance](https://docs.sd-core.opennetworking.org/main/overview/3gpp-compliance-5g.html)
 
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