Auto merge of #3388 - smeredith:patch-1, r=micbou
Specify python3 in the README
If the user has both python 2 and 3, and 2 is the configured alternative, the instructions will fail with missing headers. This change makes it clear that python3 is needed for this step (because a previous step installed python3-dev.)
# PR Prelude
Thank you for working on YCM! :)
**Please complete these steps and check these boxes (by putting an `x` inside
the brackets) _before_ filing your PR:**
- [x] I have read and understood YCM's [CONTRIBUTING][cont] document.
- [x] I have read and understood YCM's [CODE_OF_CONDUCT][code] document.
- [x] I have included tests for the changes in my PR. If not, I have included a
rationale for why I haven't.
- [x] **I understand my PR may be closed if it becomes obvious I didn't
actually perform all of these steps.**
# Why this change is necessary and useful
If the user has both python 2 and 3, and 2 is the configured alternative, the instructions will fail with missing headers. This change makes it clear that python3 is needed for this step (because a previous step installed python3-dev.)
README.md change only--no tests needed.
I successfully followed the instructions with the new command.
[Please explain **in detail** why the changes in this PR are needed.]
[cont]: https://github.com/Valloric/YouCompleteMe/blob/master/CONTRIBUTING.md
[code]: https://github.com/Valloric/YouCompleteMe/blob/master/CODE_OF_CONDUCT.md
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