[gobject-introspection] Add the generated _version.py to .gitignore

[Christoph Reiter <creiter src gnome org>]

commit a03dd21d9cd5c6e634231ea6a29ac50fa7bb989c
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Sat Aug 11 16:54:34 2018 +0200

    Add the generated _version.py to .gitignore

 .gitignore | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/.gitignore b/.gitignore
index 9b3e0fa1..c0b05fd0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -134,6 +134,8 @@ docs/reference/version.xml
 #Shinx documentation output
 docs/giscanner/_build/*
 
+giscanner/_version.py
+
 #g-ir-doc-tool tests
 *.page
 !tests/scanner/*-expected/*.page