Add CHANGELOG.md

Author: adrhill

CHANGELOG.md

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+# UnicodeGraphics.jl
+## Version `v0.2.1`
+* ![Feature][badge-feature] Added support for multidimensional arrays ([#7][pr-7])
+
+## Version `v0.2.0`
+* ![Feature][badge-feature] Directly write to `stdout` using `uprint(A)` or to any IO using `uprint(io, A)` ([#5][pr-5])
+* ![Feature][badge-feature] Added support for filtering functions to `uprint` and `ustring`. `uprint(f, A)` shows values of `A` for which `f` returns `true` ([#5][pr-5])
+* ![Deprecation][badge-deprecation] Deprecated `brailize(A)`, use `ustring(A)` or `ustring(A, :braille)` instead ([#5][pr-5])
+* ![Deprecation][badge-deprecation] Deprecated `blockize(A)`, use `ustring(A, :block)` instead ([#5][pr-5])
+
+<!--
+# Badges
+![BREAKING][badge-breaking]
+![Deprecation][badge-deprecation]
+![Feature][badge-feature]
+![Enhancement][badge-enhancement]
+![Bugfix][badge-bugfix]
+![Experimental][badge-experimental]
+![Maintenance][badge-maintenance]
+![Documentation][badge-docs]
+-->
+
+[pr-5]: https://github.com/JuliaGraphics/UnicodeGraphics.jl/pull/5
+[pr-7]: https://github.com/JuliaGraphics/UnicodeGraphics.jl/pull/7
+
+[badge-breaking]: https://img.shields.io/badge/BREAKING-red.svg
+[badge-deprecation]: https://img.shields.io/badge/deprecation-orange.svg
+[badge-feature]: https://img.shields.io/badge/feature-green.svg
+[badge-enhancement]: https://img.shields.io/badge/enhancement-blue.svg
+[badge-bugfix]: https://img.shields.io/badge/bugfix-purple.svg
+[badge-security]: https://img.shields.io/badge/security-black.svg
+[badge-experimental]: https://img.shields.io/badge/experimental-lightgrey.svg
+[badge-maintenance]: https://img.shields.io/badge/maintenance-gray.svg
+[badge-docs]: https://img.shields.io/badge/docs-orange.svg