Fix caching (#489)

- Remove unused 0.9.8 dir
- reenable normal pip caching
diff --git a/.travis.yml b/.travis.yml
index 77d6bc8..78051af 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,8 +3,7 @@
 
 cache:
   directories:
-#    - $HOME/.cache/pip
-    - $HOME/ossl-098
+    - $HOME/.cache/pip
 
 env:
   global: