Allow for DNSimple User API tokens to be used by implementing the DNS…

…IMPLE_ACCOUNT_ID and DNSIMPLE_ZONES environment variables

Fix code linting error - use !skipWhoami instead of skipWhoami == false

provider/dnsimple/dnsimple.go

@@ -125,7 +125,7 @@ func BuildDnsimpleProvider(domainFilter endpoint.DomainFilter, zoneIDFilter prov
 	}
 
 	whoamiResponse := &dnsimple.WhoamiResponse{}
-	if skipWhoami == false {
+	if !skipWhoami {
 		var err error
 		whoamiResponse, err = provider.identity.Whoami(context.Background())
 		if err != nil {