Update pyasn1 from 0.1.9 to 0.2.1

requirements/prod.txt

@@ -289,10 +289,16 @@ pyOpenSSL==16.2.0 \
     --hash=sha256:26ca380ddf272f7556e48064bbcd5bd71f83dfc144f3583501c7ddbd9434ee17 \
     --hash=sha256:7779a3bbb74e79db234af6a08775568c6769b5821faecf6e2f4143edb227516e
 # pyasn1 is required by cryptography
-pyasn1==0.1.9 \
-    --hash=sha256:2f96ed5a0c329ca16230b326ca12b7461ec8f65e0be3e4f997516f36bf82a345 \
-    --hash=sha256:28fee44217991cfad9e6a0b9f7e3f26041e21ebc96629e94e585ccd05d49fa65 \
-    --hash=sha256:853cacd96d1f701ddd67aa03ecc05f51890135b7262e922710112f12a2ed2a7f
+pyasn1==0.2.1 \
+    --hash=sha256:7deaf59f68f0c86cd49f377d907b6481891a854899c2df8053cef605e1a3be88 \
+    --hash=sha256:7a78befa1918c109e452c19e49333ab182eabb2cac408da6fb601aa3a2fe61a1 \
+    --hash=sha256:cf6fe5d14a146dbb72af014d30efe11e837280e2afe25442fb88ae25def3ce54 \
+    --hash=sha256:6ab18487016cbd838eed41ce64f2740df255b0925cd7a341a4435a337f326074 \
+    --hash=sha256:d06cb48481a31dd1e6263b18e81270f2974973776958580f049312395b62507c \
+    --hash=sha256:0e1db9ca2765a95bac06fd7a1ea830203bda4f1f6c360ba9cf6fa080c8efe390 \
+    --hash=sha256:0c9a2b57dee7e481cf5000c41758ccde06fed392bfd36a7359b4379f38fd3bf6 \
+    --hash=sha256:ffa0649a9d780481c0352f8e5a4de40ad63bf9436c376afb50f05b17731dd529 \
+    --hash=sha256:06b9cdfb14e81e7a3b9c0f63ab19bc3b9bfc5cd372d766179884c0703c2213e8
 # pycparser is required by cffi
 pycparser==2.17 \
     --hash=sha256:0aac31e917c24cb3357f5a4d5566f2cc91a19ca41862f6c3c22dc60a629673b6