minor update for kmeans out of preview (#168)

* minor update for kmeans out of preview

* oops indeed

Author: ethanglaser

configs/regular/kmeans.json

@@ -70,7 +70,7 @@
     "TEMPLATES": {
         "sklearn kmeans": {
             "SETS": [
-                "sklearn-ex[preview] implementations",
+                "sklearn-ex[cpu,gpu] implementations",
                 "common kmeans parameters",
                 "sklearn kmeans parameters",
                 "kmeans datasets"