swc-windows-installer.py: Bump version to 0.2
swc-windows-installer.py: Bump version to 0.2

Changes since v0.1:
* Install GNU Make (cherry-picked from the msysGit repository).
* Mention that R should be installed before running our installer.
* Fix some typos in docs and docstrings.

wking/swc-windows-installer,ethanwhite/windows-installer,swcarpentry/windows-installer