ci: print python/git versions before starting build

Author: ankostis

Diff for: .appveyor.yml

@@ -43,6 +43,7 @@ install:
     - |
         echo %PATH%
         uname -a
+        git --version
         where git git-daemon python pip pip3 pip34
         python --version
         python -c "import struct; print(struct.calcsize('P') * 8)"

Diff for: .travis.yml

@@ -14,6 +14,7 @@ git:
   # as we clone our own repository in the process
   depth: 99999
 install:
+  - python --version; git --version
   - git submodule update --init --recursive
   - git fetch --tags
   - pip install codecov flake8 ddt sphinx