Bump java version from 8 to 11 (#343)

Consumes the rc from metafacture-core which also uses java 11.
See metafacture/metafacture-core#515 .

build.gradle

@@ -39,13 +39,13 @@ subprojects {
       'equalsverifier': '3.8.2',
       'guava':          '29.0-jre',
       'jackson':        '2.13.3',
-      'jdk':            '8',
+      'jdk':            '11',
       'jena':           '3.17.0',
       'jetty':          '9.4.14.v20181114',
       'jquery':         '3.3.1-1',
       'junit_jupiter':  '5.8.2',
       'junit_platform': '1.4.2',
-      'metafacture':    '5.7.0',
+      'metafacture':    '6.0.0-rc1-SNAPSHOT',
       'mockito':        '2.27.0',
       'requirejs':      '2.3.6',
       'slf4j':          '1.7.21',
@@ -55,7 +55,7 @@ subprojects {
   }
 
   group = 'org.metafacture'
-  version = '0.8.0-SNAPSHOT'
+  version = '1.0.0-SNAPSHOT'
 
   apply plugin: 'checkstyle'
   apply plugin: 'eclipse'