Update the requirements.txt file, always a useful thing to do

requirements.txt

@@ -1,36 +1,36 @@
-beautifulsoup4==4.4.1
+beautifulsoup4==4.6.0
 contextlib2==0.5.5
 diff-match-patch==20121119
-dj-database-url==0.4.0
+dj-database-url==0.4.2
 dj-static==0.0.6
-Django==1.10.7
-django-debug-toolbar==1.4
-django-ical==1.3
-django-recaptcha==1.0.5
-django-registration-redux==1.4
-django-reversion==1.10.1
+Django==1.11.1
+django-debug-toolbar==1.8
+django-ical==1.4
+django-recaptcha==1.3.0
+django-registration-redux==1.6
+django-reversion==1.10.2
 django-toolbelt==0.0.1
 django-widget-tweaks==1.4.1
-gunicorn==19.4.5
-icalendar==3.9.2
-lxml==3.6.0
-Markdown==2.6.6
-Pillow==3.1.1
-psycopg2==2.6.1
-Pygments==2.1.3
-PyPDF2==1.25.1
-python-dateutil==2.5.2
-pytz==2016.3
-raven==5.12.0
-reportlab==3.3.0
+gunicorn==19.7.1
+icalendar==3.11.4
+lxml==3.7.3
+Markdown==2.6.8
+Pillow==4.1.1
+psycopg2==2.7.1
+Pygments==2.2.0
+PyPDF2==1.26.0
+python-dateutil==2.6.0
+pytz==2017.2
+raven==6.0.0
+reportlab==3.4.0
 selenium==2.53.1
-simplejson==3.8.2
+simplejson==3.10.0
 six==1.10.0
-sqlparse==0.1.19
-static3==0.6.1
+sqlparse==0.2.3
+static3==0.7.0
 svg2rlg==0.3
 yolk==0.4.3
-z3c.rml==3.0.0
+z3c.rml==3.2.0
 zope.event==4.2.0
-zope.interface==4.1.3
+zope.interface==4.4.0
 zope.schema==4.4.2