Add release notes.

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+0.*
+===
+
+
+0.82
+----
+
+**Unreleased**
+
+62/76 GNU find features supported.
+
+- Color files with multiple hard links correctly
+- At `-O3`, replace command lines with no action with `-false`
+  - For example, `bfs -true -o -print` becomes `-false`, because `-print` is not reachable
+- Move optimizations that rely on the purity of a predicate to `-O2` (the new default)
+- Optimize using De Morgan's laws:
+  - `( ! X -a ! Y ) <==> ! ( X -o Y )`
+  - `( ! X -o ! Y ) <==> ! ( X -a Y )`
+  - `! ( X -a ! Y ) <==> ( ! X -o Y )`
+  - `! ( X -o ! Y ) <==> ( ! X -a Y )`
+  - `! ( ! X -a Y ) <==> ( X -o ! Y )`
+  - `! ( ! X -o Y ) <==> ( X -a ! Y )`
+- At `-O2`, remove top-level pure expressions
+  - For example, `bfs -print , -false` becomes `-print`, because the top-level return value is ignored
+- At `-O2`, remove negations from the left-hand side of the comma operator
+  - For example, `-not -print , -print` becomes `-print , -print`, because the return value of the LHS is ignored
+- Treat `-`, `)`, and `,` as paths when required to by POSIX
+  - `)` and `,` are only supported before the expression begins
+- Implement `-D opt`
+- Implement `-fprint`
+- Implement `-fprint0`
+
+
+0.79
+----
+
+**May 27, 2016**
+
+60/76 GNU find features supported.
+
+- Remove an errant debug `printf()` from `-used`
+- Implement the `{} ;` variants of `-exec`, `-execdir`, `-ok`, and `-okdir`
+
+
+0.74
+----
+
+**March 12, 2016**
+
+56/76 GNU find features supported.
+
+- Color broken symlinks correctly
+- Fix https://github.com/tavianator/bfs/issues/7
+- Fix `-daystart`'s rounding of midnight
+- Implement (most of) `-newerXY`
+- Implement `-used`
+- Implement `-size`
+
+
+0.70
+----
+
+**February 23, 2016**
+
+53/76 GNU find features supported.
+
+- New `make install` and `make uninstall` targets
+- Squelch non-positional warnings for `-follow`
+- Reduce memory footprint by as much as 64% by closing `DIR*`s earlier
+- Speed up `bfs` by ~5% by using a better FD cache eviction policy
+- Fix infinite recursion when evaluating `! expr`
+- Optimize unused pure expressions (e.g. `-empty -a -false`)
+- Optimize double-negation (e.g. `! ! -name foo`)
+- Implement `-D stat` and `-D tree`
+- Implement `-O`
+
+
+0.67
+----
+
+**February 14, 2016**
+
+Initial release.
+
+51/76 GNU find features supported.