Undo modification on "wget" command.

.travis.yml

@@ -18,7 +18,7 @@ before_install:
 # Install miniconda to avoid compiling scipy
   - mkdir -p download
   - cd download
-  - "[ -f $HOME/download/miniconda.sh ] || wget -c https://repo.continuum.io/miniconda/Miniconda2-4.1.11-Linux-x86_64.sh -O miniconda.sh"
+  - wget -c https://repo.continuum.io/miniconda/Miniconda2-4.1.11-Linux-x86_64.sh -O miniconda.sh
   - chmod +x miniconda.sh
   - ./miniconda.sh -b
   - cd ..