Sourced from rest-client's changelog.

2.0.2

• Suppress the header override warning introduced in 2.0.1 if the value is the
  same. There's no conflict if the value is unchanged. (#578)

2.0.1

• Warn if auto-generated headers from the payload, such as Content-Type,
  override headers set by the user. This is usually not what the user wants to
  happen, and can be surprising. (#554)
• Drop the old check for weak default TLS ciphers, and use the built-in Ruby
  defaults. Ruby versions from Oct. 2014 onward use sane defaults, so this is
  no longer needed. (#573)

2.0.0

This release is largely API compatible, but makes several breaking changes.

• Drop support for Ruby 1.9
• Allow mime-types as new as 3.x (requires ruby 2.0)
• Respect Content-Type charset header provided by server. Previously,
  rest-client would not override the string encoding chosen by Net::HTTP. Now
  responses that specify a charset will yield a body string in that encoding.
  For example, Content-Type: text/plain; charset=EUC-JP will return a String
  encoded with Encoding::EUC_JP. (#361)
• Change exceptions raised on request timeout. Instead of
  RestClient::RequestTimeout (which is still used for HTTP 408), network
  timeouts will now raise either RestClient::Exceptions::ReadTimeout or
  RestClient::Exceptions::OpenTimeout, both of which inherit from
  RestClient::Exceptions::Timeout. For backwards compatibility, this still
  inherits from RestClient::RequestTimeout so existing uses will still work.
  This may change in a future major release. These new timeout classes also
  make the original wrapped exception available as #original_exception.
• Unify request exceptions under RestClient::RequestFailed, which still
  inherits from ExceptionWithResponse. Previously, HTTP 304, 401, and 404
  inherited directly from ExceptionWithResponse rather than from
  RequestFailed. Now all HTTP status code exceptions inherit from both.
• Rename the :timeout request option to :read_timeout. When :timeout is
  passed, now set both :read_timeout and :open_timeout.
• Change default HTTP Accept header to */*
• Use a more descriptive User-Agent header by default
• Drop RC4-MD5 from default cipher list
• Only prepend http:// to URIs without a scheme
• Fix some support for using IPv6 addresses in URLs (still affected by Ruby
  2.0+ bug https://bugs.ruby-lang.org/issues/9129, with the fix expected to be
  backported to 2.0 and 2.1)
• Response objects are now a subclass of String rather than a String that
  mixes in the response functionality. Most of the methods remain unchanged,
  but this makes it much easier to understand what is happening when you look
  at a RestClient response object. There are a few additional changes:

... (truncated)

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