chore(sdks): update Go version in shields.json to v0.2.1

Author: leggetter

sdks/outpost-go/shields.json

@@ -1,6 +1,6 @@
 {
   "schemaVersion": 1,
   "label": "outpost-go",
-  "message": "v0.2.0",
+  "message": "v0.2.1",
   "color": "blue"
 }