disable travis cache

yinshucheng · yinshucheng · commit 950a9b9f6fe3 · 2018-04-13T15:01:22.000+08:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,9 +1,5 @@
 language: ruby
 
-cache:
-  directories:
-  - $HOME/protobuf
-
 sudo: false
 
 before_install:
