Pin python-dateutil requirement to avoid pip install warning

requirements.txt

@@ -6,19 +6,19 @@ aws-xray-sdk==0.95
 Babel==2.5.3
 bandit==1.4.0
 boto==2.48.0
-boto3==1.7.4
-botocore==1.10.4
+boto3==1.7.10
+botocore==1.10.10
 cachetools==2.0.1
 cbapi==1.3.6
-certifi==2018.1.18
+certifi==2018.4.16
 cffi==1.11.5
 chardet==3.0.4
 cookies==2.2.1
 coverage==4.5.1
 coveralls==1.3.0
 cryptography==2.2.2
-docker==3.2.1
-docker-pycreds==0.2.2
+docker==3.3.0
+docker-pycreds==0.2.3
 docopt==0.6.2
 docutils==0.14
 gitdb2==2.0.3
@@ -34,8 +34,8 @@ lazy-object-proxy==1.3.1
 MarkupSafe==1.0
 mccabe==0.6.1
 mock==2.0.0
-moto==1.3.2
-mypy==0.580
+moto==1.3.3
+mypy==0.590
 packaging==17.1
 pbr==4.0.2
 pika==0.11.2
@@ -49,7 +49,7 @@ Pygments==2.2.0
 pyhcl==0.3.10
 pylint==1.8.4
 pyparsing==2.2.0
-python-dateutil==2.7.2
+python-dateutil==2.6.1
 pytz==2018.4
 PyYAML==3.12
 requests==2.18.4
@@ -58,7 +58,7 @@ s3transfer==0.1.13
 six==1.11.0
 smmap2==2.0.3
 snowballstemmer==1.2.1
-Sphinx==1.7.2
+Sphinx==1.7.4
 sphinx-rtd-theme==0.3.0
 sphinxcontrib-websupport==1.0.1
 stevedore==1.28.0

requirements_top_level.txt

@@ -8,6 +8,7 @@ mypy
 pyfakefs
 pyhcl
 pylint
+python-dateutil==2.6.1
 sphinx
 sphinx-rtd-theme
 yara-python==3.7.0