Add initial 0.1.0 release to changelog
* Support for Rust 1.43.1
* Fix parsing of `log10()` and `log2()`
* Add factorial operator (`!`)
+
+## v0.1.0 (2020-08-31)
+
+Initial release:
+
+* Arbitrary-precision arithmetic using rational numbers
+* Support for complex numbers
+* Binary, octal, hexadecimal and other number bases between 2 and 36.
+* Keeps track of units, with support for SI and US customary units.
+* Support for Emacs-style CLI shortcuts
+* Trigonometric functions
+* Useful physical and mathematical constants
