Update appveyor.yml

Author: LaGuer

appveyor.yml

@@ -24,7 +24,7 @@ install:
 #  - "%CMD_IN_ENV%  mkdir results"
 #  - "%CMD_IN_ENV%  cd results"
 #  - "%CMD_IN_ENV%  cd ~"
-  - "%CMD_IN_ENV%  ls; pwd"
+  - "%CMD_IN_ENV%  ls"
 test_script:
 #  - "%CMD_IN_ENV%  iptest --coverage xml"
   - "%CMD_IN_ENV%  python test_nb.py  || python test_nb.py || python test_nb.py"