Add yaml to requirements

rtd_requirements.txt

@@ -1,23 +1,24 @@
+beautifulsoup4
+dash
 demandlib
-networkx >= 2.5.0
+docutils == 0.16.0
+egoio >= 0.4.7
 geopy >= 2.0.0
+jupyter_dash
+matplotlib >= 3.3.0
+multiprocess
+networkx >= 2.5.0
 pandas >= 1.2.0
-pyproj >= 3.0.0
-pypsa >=0.17.0, <=0.20.1
+plotly
 pyomo >= 6.0
-multiprocess
-workalendar
-egoio >= 0.4.7
-matplotlib >= 3.3.0
 pypower
-scikit-learn
-beautifulsoup4
-plotly
-dash
-jupyter_dash
-docutils == 0.16.0
+pyproj >= 3.0.0
+pypsa >=0.17.0, <=0.20.1
 saio
+scikit-learn
 sphinx >= 4.3.0, < 5.1.0
 sphinx_rtd_theme >=0.5.2
 sphinx-autodoc-typehints
 sshtunnel
+workalendar
+yaml

setup.py

@@ -59,6 +59,7 @@ def read(fname):
     "sqlalchemy < 1.4.0",
     "sshtunnel",
     "workalendar",
+    "yaml",
 ]
 
 dev_requirements = [