Use Maven Central rather than JCenter

Author: wilkinsona

build.gradle

@@ -1,6 +1,6 @@
 buildscript {
 repositories {
-jcenter()
+mavenCentral()
 maven { url 'https://repo.spring.io/plugins-release' }
 maven { url 'https://plugins.gradle.org/m2/' }
 }
@@ -15,7 +15,7 @@ buildscript {
 allprojects {
 group = 'org.springframework.restdocs'
 repositories {
-jcenter()
+mavenCentral()
 }
 }