Require Ruby 2.1+ for GC::INTERNAL_CONSTANTS
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@ -21,7 +21,7 @@ Note that 3.0 is not backwards compatible with 2.x, so upgrade carefully! In par
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## Installation
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Requires Ruby 2.0+
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Requires Ruby 2.1+. Ruby 2.3+ is recommended.
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```bash
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gem install twitter_ebooks
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