Downgrade tokio to 0.2.13
It seems there is a problem with mysql_async on the new version.
@@ -2883,9 +2883,9 @@ dependencies = [
[[package]]
name = "tokio"
-version = "0.2.14"
+version = "0.2.13"
source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2751672f9da075d045c67fdb0068be9850ab7b231fa77bb51d6fd35da9c0bb0d"
+checksum = "0fa5e81d6bc4e67fe889d5783bd2a128ab2e0cfa487e0be16b6a8d177b101616"
dependencies = [
"bytes",
"fnv",
