Fix broken 111 API Catalogue link (#276)

Author: Adrian Clay

README.md

@@ -1,5 +1,6 @@
 # integration-adaptor-111
-The 111 adaptor enables GP Practices to receive [NHS 111 Report messages](https://digital.nhs.uk/developer/api-catalogue/nhs-111-hl7-v3) from NHS 111, for example into a GP system, following a patient's call to the free NHS 111 service. 
+
+The 111 adaptor enables GP Practices to receive [NHS 111 Report messages](https://digital.nhs.uk/developer/api-catalogue/nhs-111) from NHS 111, for example into a GP system, following a patient's call to the free NHS 111 service. 
 
 You can receive and route a “post event message” to their GP when NHS 111 requests:
 
@@ -126,4 +127,4 @@ This tool provides resources that will allow you to adequately test the 111 adap
 Our testing pack as well our test harness can be found inside the test-suite directory [Test-Suite](./test-suite)
 
 ## NIA Support (NHS England) guidance
-If you are looking to make changes to the adaptor you should first read the [guidance for developing the adaptor](nhs-england-developer-information.md).
+If you are looking to make changes to the adaptor you should first read the [guidance for developing the adaptor](nhs-england-developer-information.md).