Set livebook min_machines_running to 1

Set the livebook min_machines_running to 1 so that it doesn't spin down
the application and make me manually kick it over via the CLI.

Author: SamuelWillis

Diff for: livebook/fly.toml

@@ -9,13 +9,13 @@ primary_region = "yyz"
 [build]
 
 [http_service]
-  internal_port = 8080
-  force_https = true
-  auto_stop_machines = true
-  auto_start_machines = true
-  min_machines_running = 0
-  processes = ["app"]
+internal_port = 8080
+force_https = true
+auto_stop_machines = true
+auto_start_machines = true
+min_machines_running = 1
+processes = ["app"]
 
 [[vm]]
-  size = "shared-cpu-1x"
-  memory = 1024
+size = "shared-cpu-1x"
+memory = 1024