Update activemerchant and Drop support for EOL Ruby #103
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https://github.com/activemerchant/active_merchant#api-stability-policy によると、ActiveMarchant自体のAPIはメジャーバージョンが同じならば互換性があるということになっているので、バージョンの指定方法を変更します。
また、付随する問題として、 #102 でRuby 2.5以上のテストが落ちているというのがあります。
これは、 https://github.com/activemerchant/active_merchant/blob/630edd91c87e649f6edd34dd8cbb0092aff70829/lib/active_merchant/network_connection_retries.rb#L1 のrequireがないと
OpenSSL
クラスの探索に失敗して、NameErrorがでるという問題です。