Fixed conversion of GString to String; fixes gh-762

spring-cloud-contract-spec/src/main/groovy/org/springframework/cloud/contract/spec/internal/Request.groovy

@@ -101,6 +101,10 @@ class Request extends Common {
 		this.urlPath = new UrlPath(path)
 	}
 
+	void urlPath(GString path) {
+		this.urlPath = new UrlPath(path)
+	}
+
 	void urlPath(DslProperty path) {
 		this.urlPath = new UrlPath(path)
 	}
@@ -111,6 +115,12 @@ class Request extends Common {
 		closure()
 	}
 
+	void urlPath(GString path, @DelegatesTo(UrlPath) Closure closure) {
+		this.urlPath = new UrlPath(path)
+		closure.delegate = urlPath
+		closure()
+	}
+
 	void urlPath(DslProperty path, @DelegatesTo(UrlPath) Closure closure) {
 		this.urlPath = new UrlPath(path)
 		closure.delegate = urlPath

spring-cloud-contract-spec/src/main/groovy/org/springframework/cloud/contract/spec/internal/UrlPath.groovy

@@ -35,6 +35,10 @@ class UrlPath extends Url {
 		super(path)
 	}
 
+	UrlPath(GString path) {
+		super(path)
+	}
+
 	UrlPath(DslProperty path) {
 		super(path)
 	}