Add SQL as a common initialism.
diff --git a/lint.go b/lint.go
index 58b01d7..0501e2c 100644
--- a/lint.go
+++ b/lint.go
@@ -719,6 +719,7 @@
 	"RPC":   true,
 	"SLA":   true,
 	"SMTP":  true,
+	"SQL":   true,
 	"SSH":   true,
 	"TCP":   true,
 	"TLS":   true,