Prepare for 5.2-1.12.0 release.

CERT

 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----

CHANGELOG.md

-# Changes in version 5.1-1.12.0 - 2018-??-??
+# Changes in version 5.2-1.12.0 - 2018-04-06
 
  * Medium changes
    - Add version_status field to details documents.

build.xml

@@ -8,10 +8,10 @@
 
   <property name="javadoc-title" value="Onionoo API Documentation"/>
   <property name="implementation-title" value="Onionoo" />
-  <property name="onionoo.protocol.version" value="5.1"/>
+  <property name="onionoo.protocol.version" value="5.2"/>
   <property name="release.version"
-            value="${onionoo.protocol.version}-1.11.0-dev"/>
-  <property name="metricslibversion" value="2.1.1"/>
+            value="${onionoo.protocol.version}-1.12.0"/>
+  <property name="metricslibversion" value="2.2.0"/>
   <property name="jetty.version" value="-9.2.21.v20170120" />
   <property name="warfile"
             value="onionoo-${release.version}.war"/>

src/main/java/org/torproject/onionoo/server/ResponseBuilder.java

@@ -122,7 +122,7 @@ public class ResponseBuilder {
     return this.charsWritten;
   }
 
-  private static final String PROTOCOL_VERSION = "5.1";
+  private static final String PROTOCOL_VERSION = "5.2";
 
   private static final String NEXT_MAJOR_VERSION_SCHEDULED = "2018-04-14";