add .venv in gitignore

Change-Id: Ief1bbffcd542cdf836849ebb70ea6ba3dcc0aaba
diff --git a/.gitignore b/.gitignore
index 6d8b35d..bde2c36 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,3 +16,6 @@
 
 # Editor config.
 .vscode/
+
+# Virtual env
+.venv