arb-fft-0.2.0.2: CHANGELOG.markdown

0.2.0.2
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* Fix documentation image links.

0.2.0.1
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* Improve API documentation.

0.2.0.0
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* Switch to main API based on generic vectors.
* Custom build setup to use LLVM if it's there and fall back on native
  code generator if it's not.
* Switch to BSD3 license.