[meld] Update the gitignore file

[Kai Willadsen <kaiw src gnome org>]

commit 9eba8e28b64c4e85de26bbc86aef95429f46b38c
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Tue Nov 6 06:19:20 2018 +1000

    Update the gitignore file

 .gitignore | 33 +++++++++++++++++++++++----------
 1 file changed, 23 insertions(+), 10 deletions(-)
---
diff --git a/.gitignore b/.gitignore
index 716cc1ee..6e83d795 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,15 +1,28 @@
-*.pyc
+# VCS conflicts
 *.orig
 *.rej
-*.desktop
-*.install
-data/appdata.xml
-data/mime/meld.xml
-.cache/
+
+# Byte compiled Python files
+__pycache__/
+*.pyc
+
+# Compiled resources
+data/gschemas.compiled
+
+# External tooling caches
 .flatpak-builder/
 .mypy_cache/
-build
-dist
-MANIFEST
-data/gschemas.compiled
+.pytest_cache/
+
+# Build & distribution artifacts
 build/
+dist/
+MANIFEST
+
+# Special project build artifacts
+*-installed
+
+# Files created from intltool .in templates
+*.desktop
+data/appdata.xml
+data/mime/meld.xml