Upgrade requirements. [ci skip]

requirements.txt

@@ -2,7 +2,7 @@ alembic==0.9.8
 appdirs==1.4.3
 Babel==2.5.3
 Beaker==1.9.0
-bleach==2.1.2
+bleach==2.1.3
 bleach-whitelist==0.0.8
 Chameleon==3.2
 colander==1.4
@@ -49,7 +49,7 @@ pyramid-deform==0.2
 pyramid-mailer==0.15.1
 pyramid-tm==2.2
 pyramid-zcml==1.1.0
-python-dateutil==2.6.1
+python-dateutil==2.7.0
 python-editor==1.0.3
 pytz==2018.3
 repoze.lru==0.7
@@ -59,9 +59,9 @@ repoze.zcml==1.0b1
 rfc6266-parser==0.0.5.post2
 shutilwhich==1.1.0
 six==1.11.0
-SQLAlchemy==1.2.3
-SQLAlchemy-Utils==0.33.0
-transaction==2.1.2
+SQLAlchemy==1.2.5
+SQLAlchemy-Utils==0.33.1
+transaction==2.2.0
 translationstring==1.3
 Unidecode==1.0.22
 usersettings==1.0.7