Update to Pelican 4.0.1

requirements.txt

@@ -4,10 +4,11 @@ feedgenerator==1.9
 html5lib==0.999999999
 Jinja2==2.10
 Markdown==2.6.9
-MarkupSafe==1.0
-pelican==3.7.1
-Pygments==2.2.0
-python-dateutil==2.7.3
-pytz==2018.4
-six==1.11.0
-Unidecode==1.0.22
+MarkupSafe==1.1.0
+pelican==4.0.1
+Pygments==2.3.1
+python-dateutil==2.7.5
+pytz==2018.7
+six==1.12.0
+Unidecode==1.0.23
+webencodings==0.5.1