add hint about specific junit5spring dependency

I was wondering about missing dependencies for `MockMvcTestTarget`. Found it in an issue (pact-foundation#1072 (comment)) but not in the docs

provider/junit5spring/README.md

@@ -2,6 +2,14 @@
 
 This module extends the base [Pact JUnit5 module](/provider/junit5/README.md). See that for more details.
 
+## Dependency
+The combined library (JUnit5 + Spring) is available on maven central using:
+
+group-id = au.com.dius.pact.provider
+artifact-id = junit5spring
+version-id = 4.1.x
+
+## Usage
 For writing Spring Pact verification tests with JUnit 5, there is an JUnit 5 Invocation Context Provider that you can use with 
 the `@TestTemplate` annotation. This will generate a test for each interaction found for the pact files for the provider.
 
@@ -98,4 +106,4 @@ class MockMvcTestTargetStandaloneMockMvcTestJava {
 ```
 
 **Important:** Since `@WebMvcTest` starts only Spring MVC components you can't use `PactVerificationSpringProvider` 
-and need to fallback to `PactVerificationInvocationContextProvider`
+and need to fallback to `PactVerificationInvocationContextProvider`