Support Mint

[falood]

https://hex.pm/packages/mint

[secretworry]

Hi, @falood
I just gave the mint a skim. A very cool HTTP lib having a very straightforward implementation with leaving connection management to the user.

Maxwell made an assumption that all request methods have side-effects managing an implicit connection pool. , so that Maxwell doesn't incur any connect and close actions.

The assumption doesn't apply to mint, so we might need to invent a new concept, a connection pool manager adapter. And that requires more adaptations. @zhongwencool We might need a discussion over this.

[secretworry]

Just noticed mint is considering pooling their connections ericmj/mint#32. We just need to wait for the enhancement's debut.