Add HTTPS, SSH and TLS as common initialisms.

Signed-off-by: David Symonds <dsymonds@golang.org>
diff --git a/lint.go b/lint.go
index 80db56e..a1161da 100644
--- a/lint.go
+++ b/lint.go
@@ -449,6 +449,7 @@
 	"EOF":   true,
 	"HTML":  true,
 	"HTTP":  true,
+	"HTTPS": true,
 	"ID":    true,
 	"IP":    true,
 	"JSON":  true,
@@ -458,6 +459,8 @@
 	"RHS":   true,
 	"RPC":   true,
 	"SLA":   true,
+	"SSH":   true,
+	"TLS":   true,
 	"TTL":   true,
 	"UI":    true,
 	"UID":   true,