Updated a bunch of dependencies

api/requirements/base.txt

@@ -5,7 +5,7 @@ django>=2.1,<2.2
 django-environ>=0.4,<0.5
 
 # Images
-Pillow>=4.3,<4.4
+Pillow>=5.4,<5.5
 
 # For user registration, either via email or social
 # Well-built with regular release cycles!
@@ -16,14 +16,14 @@ django-allauth>=0.36,<0.37
 psycopg2-binary>=2.7,<=2.8
 
 # Time zones support
-pytz==2017.3
+pytz==2018.9
 
 # Redis support
-django-redis>=4.5,<4.6
-redis>=2.10,<2.11
+django-redis>=4.10,<4.11
+redis>=3.0,<3.1
 
 
-celery>=4.1,<4.2
+celery>=4.2,<4.3
 
 
 # Your custom requirements go here
@@ -31,7 +31,6 @@ django-cors-headers>=2.1,<2.2
 musicbrainzngs==0.6
 djangorestframework>=3.9,<3.10
 djangorestframework-jwt>=1.11,<1.12
-oauth2client<4
 pendulum>=2,<3
 persisting-theory>=0.2,<0.3
 django-versatileimagefield>=1.9,<1.10
@@ -40,12 +39,10 @@ django-rest-auth>=0.9,<0.10
 beautifulsoup4>=4.6,<4.7
 Markdown>=2.6,<2.7
 ipython>=6,<7
-mutagen>=1.39,<1.40
+mutagen>=1.42,<1.43
 
 
-# Until this is merged
 django-taggit>=0.22,<0.23
-# Until this is merged
 pymemoize==1.0.3
 
 django-dynamic-preferences>=1.7,<1.8