updated binder links

Author: robertmartin8

README.md

@@ -19,7 +19,7 @@
     <a href="https://pyportfolioopt.readthedocs.io/en/latest/">
         <img src="https://img.shields.io/badge/docs-passing-brightgreen.svg"
             alt="docs"></a> &nbsp;
-    <a href="https://mybinder.org/v2/gh/robertmartin8/pyportfolioopt/master">
+    <a href="https://mybinder.org/v2/gh/robertmartin8/pyportfolioopt/master/?filepath=cookbook">
         <img src="https://mybinder.org/badge_logo.svg"
             alt="binder"></a> &nbsp;
 </p>

docker/Dockerfile

@@ -7,6 +7,7 @@ RUN buildDeps='gcc g++' && \
     apt-get update && apt-get install -y $buildDeps --no-install-recommends && \
     pip install --upgrade pip==21.0.1 && \
     pip install "poetry==1.1.4" && \
+    pip install yfinance && \
     poetry install -E optionals --no-root && \
     apt-get purge -y --auto-remove $buildDeps
 

docs/index.rst

@@ -44,7 +44,7 @@ Installation
 ============
 
 If you would like to play with PyPortfolioOpt interactively in your browser, you may launch Binder
-`here <https://mybinder.org/v2/gh/robertmartin8/pyportfolioopt/master>`__. It takes a
+`here <https://mybinder.org/v2/gh/robertmartin8/pyportfolioopt/master/?filepath=cookbook>`__. It takes a
 while to set up, but it lets you try out the cookbook recipes without having to install anything.
 
 Prior to installing PyPortfolioOpt, you need to install C++. On macOS, this means that you need