Removed unused `import "C"` statement (#416)

diff --git a/pulsar/internal/connection.go b/pulsar/internal/connection.go
index adefb36..7010b13 100644
--- a/pulsar/internal/connection.go
+++ b/pulsar/internal/connection.go
@@ -17,7 +17,6 @@
 
 package internal
 
-import "C"
 import (
 	"crypto/tls"
 	"crypto/x509"