Upgrade cryptography to 2.7 (#24852)

homeassistant/package_constraints.txt

@@ -7,7 +7,7 @@ async_timeout==3.0.1
 attrs==19.1.0
 bcrypt==3.1.6
 certifi>=2019.6.16
-cryptography==2.6.1
+cryptography==2.7
 distro==1.4.0
 hass-nabucasa==0.15
 home-assistant-frontend==20190627.0

requirements_all.txt

@@ -8,7 +8,7 @@ certifi>=2019.6.16
 importlib-metadata==0.15
 jinja2>=2.10.1
 PyJWT==1.7.1
-cryptography==2.6.1
+cryptography==2.7
 pip>=8.0.3
 python-slugify==3.0.2
 pytz>=2019.01

setup.py

@@ -42,7 +42,7 @@ REQUIRES = [
     'jinja2>=2.10.1',
     'PyJWT==1.7.1',
     # PyJWT has loose dependency. We want the latest one.
-    'cryptography==2.6.1',
+    'cryptography==2.7',
     'pip>=8.0.3',
     'python-slugify==3.0.2',
     'pytz>=2019.01',