Replace git.apache.org imports with github.com

Client: go
diff --git a/tutorial/go/src/server.go b/tutorial/go/src/server.go
index e4c4b97..95708eb 100644
--- a/tutorial/go/src/server.go
+++ b/tutorial/go/src/server.go
@@ -22,7 +22,7 @@
 import (
 	"crypto/tls"
 	"fmt"
-	"git.apache.org/thrift.git/lib/go/thrift"
+	"github.com/apache/thrift/lib/go/thrift"
 	"tutorial"
 )