Update bower.json

The version specified in the bower.json of package converse mismatches the tag (0.5.2 vs 0.5.0)

bower.json

 {
   "name": "converse",
-  "version": "0.5.0",
+  "version": "0.5.2",
   "devDependencies": {
     "jasmine": "https://github.com/jcbrand/jasmine.git#1_3_x"
   },