http -> https

Author: ivigamberdiev

README.md

@@ -8,7 +8,7 @@
 pyfolio is a Python library for performance and risk analysis of
 financial portfolios developed by
 [Quantopian Inc](https://www.quantopian.com). It works well with the
-[Zipline](http://zipline.io) open source backtesting library.
+[Zipline](https://www.zipline.io/) open source backtesting library.
 
 At the core of pyfolio is a so-called tear sheet that consists of
 various individual plots that provide a comprehensive image of the
@@ -19,7 +19,7 @@ sheet analyzing a strategy:
 ![simple tear 1](https://github.com/quantopian/pyfolio/raw/master/docs/simple_tear_1.png "Example tear sheet created from a Zipline algo")
 
 Also see [slides of a talk about
-pyfolio](http://nbviewer.jupyter.org/format/slides/github/quantopian/pyfolio/blob/master/pyfolio/examples/pyfolio_talk_slides.ipynb#/).
+pyfolio](https://nbviewer.jupyter.org/format/slides/github/quantopian/pyfolio/blob/master/pyfolio/examples/pyfolio_talk_slides.ipynb#/).
 
 ## Installation
 
@@ -31,7 +31,7 @@ pip install pyfolio
 
 #### Development
 
-For development, you may want to use a [virtual environment](http://docs.python-guide.org/en/latest/dev/virtualenvs/) to avoid dependency conflicts between pyfolio and other Python projects you have. To get set up with a virtual env, run:
+For development, you may want to use a [virtual environment](https://docs.python-guide.org/en/latest/dev/virtualenvs/) to avoid dependency conflicts between pyfolio and other Python projects you have. To get set up with a virtual env, run:
 ```bash
 mkvirtualenv pyfolio
 ```
@@ -61,7 +61,7 @@ echo "backend: TkAgg" > ~/.matplotlib/matplotlibrc
 ## Usage
 
 A good way to get started is to run the pyfolio examples in
-a [Jupyter notebook](http://jupyter.org/). To do this, you first want to
+a [Jupyter notebook](https://jupyter.org/). To do this, you first want to
 start a Jupyter notebook server:
 
 ```bash