[gimp-web/migrate/py3] Add py3-venv to .gitignore for venv while migrating

[Pat David <patdavid src gnome org>]

commit 5621707e34616bdaef1c1a5d6a708f28ee1caeaa
Author: Pat David <patdavid gmail com>
Date:   Thu Jul 11 16:19:19 2019 -0500

    Add py3-venv to .gitignore for venv while migrating

 .gitignore | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/.gitignore b/.gitignore
index 7aa4f614..037cf753 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,3 +15,6 @@ __pycache__/
 
 # Vim swap files
 *.swp
+
+# Python 3 virtual environment
+py3-venv