Set DNS TTL 600 -> 30, update dependencies

Author: fionn

app/server_admin/dns.py

@@ -102,7 +102,7 @@ def ips_from_record(record: dict) -> Set[IPv4Address]:
         return ips
 
     def _a_record(self, name: str, ips: Set[IPv4Address],
-                  action: str, ttl: int = 600) -> None:
+                  action: str, ttl: int = 30) -> None:
         change_batch = {
             "Comment": "add {} -> {}"
                        .format(name, ", ".join([ip.exploded for ip in ips])),

requirements.txt

@@ -1,3 +1,3 @@
 flask == 1.1.1
-boto3 == 1.9.188
+boto3 == 1.9.210
 gunicorn == 19.9.0

requirements_dev.txt

@@ -1,3 +1,3 @@
 mypy >= 0.720
 pylint >= 2.3.1
-python-dotenv >= 0.10.1
+python-dotenv >= 0.10.3