Add .cache dir to gitignore

redian · redian · commit 4a576b06e845 · 2015-11-26T21:04:23.000Z
I think this could be handy and potentially minimise the risk
anyone commits it to the project.

```
flask - (master) $ tree .cache/
.cache/
└── v
    └── cache
        └── lastfailed

```
diff --git a/.gitignore b/.gitignore
@@ -9,3 +9,4 @@ build
 *.egg-info
 _mailinglist
 .tox
+.cache/
