Use different ppa for vim

.travis.yml

@@ -1,9 +1,9 @@
 language: ruby
 
-before_install: |
-  sudo add-apt-repository -y ppa:fcwu-tw/ppa
-  sudo apt-get update
-  sudo apt-get install -y vim
+before_install:
+  - sudo add-apt-repository -y ppa:nmi/vim-snapshots
+  - sudo apt-get -qq update
+  - sudo apt-get -qq install vim
 
 before_script:
   git clone https://github.com/junegunn/vader.vim.git test/vader/vader.vim