Attempt to cache all lua dependencies

.travis.yml

@@ -2,7 +2,7 @@ language: c
 sudo: false
 
 cache:
-  directories: cache
+  directories: here
 
 matrix:
   include:
@@ -19,11 +19,11 @@ matrix:
 
 install:
   - wget https://raw.githubusercontent.com/mpeterv/hererocks/0.3.1/hererocks.py
-  - python hererocks.py here --$LUA -r^ --downloads cache --builds cache --no-git-cache
+  - python hererocks.py here --$LUA -r https://github.com/mpeterv/luarocks@upgrade-install
   - export PATH=$PATH:$PWD/here/bin
-  - luarocks install lanes
-  - luarocks install busted
-  - luarocks install luacov-coveralls
+  - luarocks install lanes --upgrade --upgrade-deps
+  - luarocks install busted --upgrade --upgrade-deps
+  - luarocks install luacov-coveralls --upgrade --upgrade-deps
 
 script:
   - busted -c