Create CHANGELOG.md

CHANGELOG.md

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+# Change Log
+
+## [Unreleased]
+- Added `pub` modifier to `py_class!` syntax: `py_class!(pub class ClassName |py| ...)`
+- Changed `obj.extract::<Vec<T>>(py)` to work with any object implementing the sequence protocol; not just lists.
+- Added the `buffer` module, which allows safe access to the [buffer protocol](https://docs.python.org/3/c-api/buffer.html).
+  This allows zero-copy access to numpy arrays.
+- When building with `--feature nightly`, `extract::<Vec<PrimitiveType>>` will try to use the buffer protocol
+  before falling back to the sequence protocol.
+
+## 0.1.0 - 2016-12-17
+- First release that works on stable Rust.
+
+[Unreleased]: https://github.com/dgrunwald/rust-cpython/compare/0.1.0...HEAD