Fix travis

Author: phadej

.travis.yml

@@ -65,7 +65,7 @@ install:
 # any command which exits with a non-zero exit code causes the build to fail.
 script:
  - if [ -f configure.ac ]; then autoreconf -i; fi
- - rm -rf dist/
+ - rm -rf dist/ .ghc.environment.*
  - cabal sdist # test that a source-distribution can be generated
  - cd dist/
  - SRCTAR=(${PKGNAME}-*.tar.gz)