Begin keeping a changelog

As recommended by https://keepachangelog.com/

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+## [Unreleased]
+
+## [2.0.0] - 2020-06-17
+### Changed
+- Config sections must now specify their type explicitly
+
+### Added
+- type=symlink search paths
+
+
+## [1.5.1] - 2020-06-17
+### Fixed
+- Support old mypy version 0.701 (by working around its bugs)
+- Version numbers are now semver
+
+
+## [1.5] - 2020-06-12
+### Fixed
+- Support log.showSignature
+
+
+## [1.4] - 2020-06-11
+First usable version