Print version of CMake and Python

Author: ruslo

.travis.yml

@@ -12,6 +12,8 @@ install:
   - wget "https://github.com/ruslo/polly/archive/v${POLLY_VERSION}.tar.gz"
   - tar xf "v${POLLY_VERSION}.tar.gz"
   - export PATH="`pwd`/polly-${POLLY_VERSION}/bin:${PATH}"
+  - cmake --version
+  - python3 --version
 
 script:
   - build.py --verbose --pack TGZ --config Release