add echo and remove call to tree

Author: chessai

.travis.yml

@@ -36,11 +36,11 @@ matrix:
     - compiler: ghc-8.2.2
       addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-8.2.2","cabal-install-2.4"]}}
 before_install:
+  - echo 'Downloading arrayfire-3.6.4'  
   - curl -O http://arrayfire.s3.amazonaws.com/3.6.4/ArrayFire-v3.6.4_Linux_x86_64.sh
   - chmod +x ArrayFire-v3.6.4_Linux_x86_64.sh
   - ./ArrayFire-v3.6.4_Linux_x86_64.sh --include-subdir --prefix=/opt
   - ls -lah /opt/arrayfire/
-  - tree /opt/arrayfire/
   - HC=$(echo "/opt/$CC/bin/ghc" | sed 's/-/\//')
   - WITHCOMPILER="-w $HC"
   - HCPKG="$HC-pkg"