Add changelog

Author: prasmussen

CHANGELOG.md

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+# Changelog
+All notable changes to any of the glot components will be documented in this file.
+
+## 2021-04-01
+- Create container with read-only rootfs and mount /tmp and /home/glot as tmpfs
+- Update (almost) all languages
+- Install more tools in the bash image (sed, grep, awk, git, etc...)
+
+## 2021-03-27
+- Add keyboard shortcut for running code (cmd+enter / ctrl+enter)
+- Make it easier to change the filename when clicking on the active tab
+- Update frontend libs: jquery, bootstrap, etc
+- Install lodash, jest and axios in the javascript image
+
+## 2021-03-14
+- Add support for Nix language