[Tests] Print shell version in Travis CI

Author: PeterDaveHello

.travis.yml

@@ -23,6 +23,9 @@ before_install:
   - $SHELL --version 2> /dev/null || dpkg -s $SHELL 2> /dev/null || which $SHELL
   - curl --version
   - wget --version
+  - bash --version | head
+  - zsh  --version
+  - dpkg -s dash | grep ^Version | awk '{print $2}'
 install:
   - if [ -n "${SHELLCHECK-}" ]; then cabal update && cabal install transformers-0.4.3.0 ShellCheck && shellcheck --version ; fi
   - if [ -z "${SHELLCHECK-}" ]; then nvm install node && npm install && npm prune && npm ls urchin doctoc; fi