Bump to 3.1.0

Author: Janiczek

elm.json

@@ -3,7 +3,7 @@
     "name": "GlobalWebIndex/class-namespaces",
     "summary": "Elm module for building HTML classes based on weak-css rules",
     "license": "BSD-3-Clause",
-    "version": "3.0.1",
+    "version": "3.1.0",
     "exposed-modules": [
         "WeakCss"
     ],
@@ -16,4 +16,4 @@
     "test-dependencies": {
         "elm-explorations/test": "1.0.0 <= v < 2.0.0"
     }
-}
+}