travis: give up trying to cache shelltestrunner dir

.travis.yml

@@ -42,7 +42,7 @@ cache:
   directories:
     - $HOME/.stack/
     - $HOME/.local/bin/
-    - shelltestrunner/
+    # - shelltestrunner/
 
 # addons:
 #   apt:
@@ -82,7 +82,8 @@ install: # ignores command failures, completed commands are collapsed in log
   - stack build Chart Chart-diagrams colour Diff here
 
   # shelltestrunner, need unreleased installable version
-  - if [ ! -d shelltestrunner ]; then git clone http://github.com/simonmichael/shelltestrunner; fi
+  #- if [ ! -d shelltestrunner ]; then git clone http://github.com/simonmichael/shelltestrunner; fi
+  - git clone http://github.com/simonmichael/shelltestrunner
   - stack install --stack-yaml=shelltestrunner/stack.yaml --resolver=lts-8.2 --install-ghc
   - shelltest --version