Release metafix at 2427f2c as 0.6.1 based on core 5.6.0 (#322)

Author: fsteeg

build.gradle

@@ -43,7 +43,7 @@ subprojects {
       'jquery':         '3.3.1-1',
       'junit_jupiter':  '5.8.2',
       'junit_platform': '1.4.2',
-      'metafacture':    '5.5.1-rc1',
+      'metafacture':    '5.6.0',
       'mockito':        '2.27.0',
       'requirejs':      '2.3.6',
       'slf4j':          '1.7.21',
@@ -53,7 +53,7 @@ subprojects {
   }
 
   group = 'org.metafacture'
-  version = '0.6.0-SNAPSHOT'
+  version = '0.6.1'
 
   apply plugin: 'checkstyle'
   apply plugin: 'eclipse'