Add .cache directory to .gitignore

lurch · lurch · commit fc95cd805636 · 2016-02-17T12:36:40.000Z
Seems to get created during `make test`
diff --git a/.gitignore b/.gitignore
@@ -26,4 +26,4 @@ pip-log.txt
 coverage
 .coverage
 .tox
-
+.cache
