Update dependency versions

Signed-off-by: Roberto Rosario <roberto.rosario@mayan-edms.com>

requirements/base.txt

@@ -1,7 +1,7 @@
-Pillow==6.0.0
+Pillow==6.2.1
 PyPDF2==1.26.0
-PyYAML==5.1.1
-celery==3.1.24
+PyYAML==5.1.2
+celery==3.1.26.post2
 django-activity-stream==0.7.0
 django-celery==3.2.1
 django-colorful==1.3
@@ -29,7 +29,7 @@ graphviz==0.10.1
 gunicorn==19.9.0
 mock==2.0.0
 node-semver==0.6.1
-pathlib2==2.3.4
+pathlib2==2.3.5
 pycountry==18.12.8
 pyocr==0.6
 python-dateutil==2.8.0
@@ -39,4 +39,4 @@ pytz==2019.1
 requests==2.21.0
 sh==1.12.14
 swagger-spec-validator==2.4.3
-whitenoise==4.1.2
+whitenoise==4.1.4

requirements/common.txt

@@ -1 +1 @@
-django==1.11.24
+django==1.11.25

requirements/development.txt

@@ -2,8 +2,8 @@ Werkzeug==0.15.4
 django-debug-toolbar==1.11
 django-extensions==2.1.9
 django-rosetta==0.9.3
-flake8==3.7.7
-ipython==5.5.0
+flake8==3.7.9
+ipython==5.8.0
 readme==0.7.1
 safety==1.8.5
 transifex-client==0.13.6