Add CHANGES.md

Author: dannyroberts

CHANGES.md

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+# Release History
+
+## dev
+
+- Add support for Python 3.10 and remove support for Python < 3.7 (past EOL)
+- Upgrade Cython for building .c files from 0.29.21 to 0.29.28
+
+## 0.9.10
+
+| Released on  | Released by |
+|--------------|-------------|
+| 2021-02-11   | @czue       |
+
+- Add official support for python 3.7 through 3.9
+- Upgrade Cython for building .c files from 0.29.6 to 0.29.21
+- Do not produce "universal wheels" (https://github.com/dimagi/jsonobject/pull/169)