[release] 1.16.0 - Fix potential memory leak, SDK Key verification (#…

…145)

Bug fix
- Fix memory leak bugs that our Diagnostic(Internal logging system) do
not always clear out related logging on time, when those events are not
being sampled or diagnostics are being disabled

Internal 
- SDK Key verification: Check if download_config_spec response match
with given instance





>Included In This Release
>- bacf115 Xin Li
>   - Fix diagnostics (#144)
>- 59283a6 sroyal-statsig
>   - SDK Key Verification (#141)

statsig_metadata.go

@@ -14,7 +14,7 @@ type statsigMetadata struct {
 func getStatsigMetadata() statsigMetadata {
 	return statsigMetadata{
 		SDKType:         "go-sdk",
-		SDKVersion:      "1.15.0",
+		SDKVersion:      "1.16.0",
 		LanguageVersion: runtime.Version()[2:],
 		SessionID:       SessionID(),
 	}