Update to new actix 1.0 api, drop actix-rt (#158)

simple-auth-server/migrations/2018-10-09-101948_users/up.sql

@@ -1,6 +1,6 @@
 -- Your SQL goes here
 CREATE TABLE users (
   email VARCHAR(100) NOT NULL UNIQUE PRIMARY KEY,
-  password VARCHAR(64) NOT NULL, --bcrypt hash
+  hash VARCHAR(122) NOT NULL, --argon hash
   created_at TIMESTAMP NOT NULL
 );