install doc: pip3 rather than pip

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,33 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Describe the bug ##
+Please describe the bug you're experiencing is precise as possible.
+
+## To Reproduce ##
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+## Expected behavior ##
+A clear and concise description of what you expected to happen.
+
+## Actual behavior, stacktrace or logfile ##
+Please describe the expected behavior here. If there is a stacktrace, please paste it here. If there is no stacktrace printed, please upload the logfile which was stored in the `tmp_folder`
+
+## Environment and installation: ##
+
+Please give details about your installation:
+
+* OS
+* Is your installation in a virtual environment or conda environment?
+* Python version
+* Auto-sklearn version

doc/installation.rst

@@ -26,20 +26,20 @@ Please install all dependencies manually with:
 
 .. code:: bash
 
-    curl https://raw.githubusercontent.com/automl/auto-sklearn/master/requirements.txt | xargs -n 1 -L 1 pip install
+    curl https://raw.githubusercontent.com/automl/auto-sklearn/master/requirements.txt | xargs -n 1 -L 1 pip3 install
 
 Then install *auto-sklearn*:
 
 .. code:: bash
 
-    pip install auto-sklearn
+    pip3 install auto-sklearn
 
 We recommend installing *auto-sklearn* into a
 `virtual environment <http://docs.python-guide.org/en/latest/dev/virtualenvs/>`_
 or an
 `Anaconda environment <https://conda.io/projects/conda/en/latest/user-guide/tasks/manage-environments.html>`_.
 
-If the ``pip`` installation command fails, make sure you have the `System requirements`_ installed correctly.
+If the ``pip3`` installation command fails, make sure you have the `System requirements`_ installed correctly.
 
 Ubuntu installation
 ===================