Release version 0.2. Add changelog

CHANGELOG.md

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+# Changelog
+
+## [0.2] - 2019-06-23
+### Changes:
+- Fixed noise from the atlas texture
+- Moved all printf-commands behind one API call
+- Bugfixes, error handling improvements and cleanup
+- Support using the same texture with multiple fonts
+- Static library on Linux/macOS
+- Render only one "empty box" for control characters.
+### Known issues:
+- No support for cubic segments yet
+- Color mapping for certain shapes is incomplete
+- Rendering calls use a geomety shader
+- Small errors in shapes, such as letters `q` and `k` with `LiberationSerif-Regular.ttf`. Visible only with a really large font size.
+- DLL build on windows not working