mark the start of 3.2 development

Author: osma

composer.json

@@ -3,7 +3,7 @@
   "description": "Thesaurus and controlled vocabulary browser using SKOS and SPARQL",
   "type": "project",
   "license": "MIT",
-  "version": "3.1",
+  "version": "3.2-dev",
   "require": {
     "sweetrdf/easyrdf": "~1.18.2",
     "twig/twig": "3.22.*",