Pin versions of packages in requirements.txt

requirements.txt

@@ -1,10 +1,10 @@
-django-appconf
-django-ses-backend
-Django==1.8.2
-django_compressor
-djmail
-futures
-premailer
-psycopg2==2.6
-pygments
-requests
+django-appconf==1.0.1
+django-ses-backend==0.1.1
+Django==1.8.5
+django_compressor==1.5
+djmail==0.11.0
+futures==3.0.3
+premailer==2.9.6
+psycopg2==2.6.1
+Pygments==2.0.2
+requests==2.8.1