Updated requirements

Author: pawelad

requirements/common.txt

@@ -1,4 +1,4 @@
 Pillow>=4.0.0
-requests>=2.12.5
+requests>=2.13.0
 six>=1.10.0
 tinycss>=0.4

requirements/dev.txt

@@ -1,11 +1,11 @@
 -r common.txt
 
-check-manifest>=0.34
+check-manifest>=0.35
 coverage>=4.3.4
 coveralls>=1.1
 flake8>=3.2.1
 flaky>=3.3.0
 pypandoc>=1.3.3
-pytest>=3.0.5
-tox>=2.5.0
+pytest>=3.0.6
+tox>=2.6.0
 twine>=1.8.1