Update dependencies

requirements/edx/base.txt

@@ -63,7 +63,7 @@ coreschema==0.0.4         # via coreapi
 cryptography==2.6.1
 cssutils==1.0.2           # via pynliner
 ddt==1.2.1
-decorator==4.3.2          # via pycontracts
+decorator==4.4.0          # via pycontracts
 defusedxml==0.5.0
 django-appconf==1.0.3     # via django-statici18n
 django-babel-underscore==0.5.2
@@ -205,7 +205,7 @@ python-swiftclient==3.7.0
 python3-saml==1.5.0
 pytz==2018.9
 pyuca==1.1
-pyyaml==3.13
+pyyaml==5.1
 redis==2.10.6
 reportlab==3.5.13
 requests-oauthlib==1.1.0

requirements/edx/development.txt

@@ -81,7 +81,7 @@ cryptography==2.6.1
 cssselect==1.0.3
 cssutils==1.0.2
 ddt==1.2.1
-decorator==4.3.2
+decorator==4.4.0
 defusedxml==0.5.0
 dicttoxml==1.7.4
 diff-cover==0.9.8
@@ -227,7 +227,7 @@ numpy==1.6.2
 oauth2==1.9.0.post1
 oauthlib==2.1.0
 openapi-codec==1.3.2
-pa11ycrawler==1.7.2
+pa11ycrawler==1.7.3
 packaging==19.0
 parsel==1.5.1
 path.py==8.2.1
@@ -289,7 +289,7 @@ python-swiftclient==3.7.0
 python3-saml==1.5.0
 pytz==2018.9
 pyuca==1.1
-pyyaml==3.13
+pyyaml==5.1
 queuelib==1.5.0
 radon==3.0.1
 redis==2.10.6

requirements/edx/paver.txt

@@ -20,7 +20,7 @@ pbr==5.1.3                # via stevedore
 psutil==1.2.1
 pymongo==2.9.1
 python-memcached==1.48
-pyyaml==3.13              # via watchdog
+pyyaml==5.1               # via watchdog
 requests==2.21.0
 six==1.11.0
 stevedore==1.30.1

requirements/edx/testing.txt

@@ -79,7 +79,7 @@ cryptography==2.6.1
 cssselect==1.0.3
 cssutils==1.0.2
 ddt==1.2.1
-decorator==4.3.2
+decorator==4.4.0
 defusedxml==0.5.0
 dicttoxml==1.7.4          # via moto
 diff-cover==0.9.8
@@ -220,7 +220,7 @@ numpy==1.6.2
 oauth2==1.9.0.post1
 oauthlib==2.1.0
 openapi-codec==1.3.2
-pa11ycrawler==1.7.2
+pa11ycrawler==1.7.3
 packaging==19.0           # via caniusepython3
 parsel==1.5.1             # via scrapy
 path.py==8.2.1
@@ -280,7 +280,7 @@ python-swiftclient==3.7.0
 python3-saml==1.5.0
 pytz==2018.9
 pyuca==1.1
-pyyaml==3.13
+pyyaml==5.1
 queuelib==1.5.0           # via scrapy
 radon==3.0.1
 redis==2.10.6