SDK-1484: Update Cryptography

Author: echarrod

requirements.in

@@ -1,5 +1,5 @@
 asn1==2.2.0
-cryptography>=2.7.0
+cryptography>=2.8.0
 cffi>=1.13.0
 future==0.18.2
 itsdangerous==0.24
@@ -11,4 +11,4 @@ pytz==2018.9
 requests>=2.20.0
 urllib3>=1.24.2
 deprecated==1.2.6
-wheel==0.24.0
+wheel==0.24.0

requirements.txt

@@ -5,11 +5,10 @@
 #    pip-compile --output-file=requirements.txt requirements.in
 #
 asn1==2.2.0               # via -r requirements.in
-asn1crypto==0.24.0        # via cryptography
 certifi==2018.11.29       # via requests
 cffi==1.13.0              # via -r requirements.in, cryptography
 chardet==3.0.4            # via requests
-cryptography==2.7         # via -r requirements.in, pyopenssl
+cryptography==2.8         # via -r requirements.in, pyopenssl
 deprecated==1.2.6         # via -r requirements.in
 future==0.18.2            # via -r requirements.in
 idna==2.7                 # via requests