Print some version numbers in travis_install.sh

scripts/dev/ci/travis_install.sh

@@ -90,9 +90,12 @@ elif [[ $TRAVIS_OS_NAME == osx ]]; then
     defaults write NSGlobalDomain NSAppSleepDisabled -bool YES
     curl -LO https://github.com/The-Compiler/homebrew-qt5-webkit/releases/download/v5.6.0-1/pyqt5-5.6.el_capitan.bottle.1.tar.gz
     curl -LO https://github.com/The-Compiler/homebrew-qt5-webkit/releases/download/v5.6.1_1-1/qt5-5.6.1-1.yosemite.bottle.1.tar.gz
+    brew --version
     brew_install python3 {qt5,pyqt5}-*.bottle.1.tar.gz
     pip_install pip
     pip_install tox
+    pip --version
+    tox --version
     check_pyqt
     exit 0
 fi
@@ -102,6 +105,9 @@ pyqt_pkgs="python3-pyqt5 python3-pyqt5.qtwebkit"
 pip_install pip
 pip_install tox
 
+pip --version
+tox --version
+
 case $TESTENV in
     py34-cov)
         pip_install codecov
@@ -117,6 +123,7 @@ case $TESTENV in
         ;;
     docs)
         apt_install $pyqt_pkgs asciidoc libpython3.4-dev
+        asciidoc --version
         check_pyqt
         ;;
     misc)
@@ -126,7 +133,10 @@ case $TESTENV in
         ;;
     eslint)
         install_node
+        echo "node: $(node --version)"
+        echo "npm: $(npm --version)"
         npm_install eslint
+        echo "eslint: $(eslint --version)"
         ;;
     *)
         echo "Unknown testenv $TESTENV!" >&2