0.1.11
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- Windows support

0.1.10
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- `LetterAvatar::AvatarHelper` module tweaks
  - `letter_avatar_url` method, returning avatar proper url
  - `letter_avatar_tag` doeas not require `ActionView::Helpers::AssetTagHelper`

0.1.9
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- `LetterAvatar::Configuration` module, `mattr_accessor` (depending on `ActiveSupport`) removed

  fixes [#7](https://github.com/ksz2k/letter_avatar/issues/7)

0.1.5
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- Use [posix-spawn](https://github.com/rtomayko/posix-spawn) to instead of Kernel#exec to get better performance.

  > fork(2) calls slow down as the parent process uses more memory due to the need to copy page tables.