Update CHANGELOG.rst

CHANGELOG.rst

 Change Log
 ==========
 
+Untagged
+---------
+
+* Compatibility:
+
+  - Avoid `h5py` deprecation warnings (MR: !123, !128)
+  - Avoid `silx` 0.13 deprecation warnings (MR: !126, !129)
+
+* Miscellaneous:
+
+  - Update test environment (MR !124)
+  - Build wheels for Python3.8 (MR !125)
+  - Update setup.py and test scripts (MR !127)
+
+
 v2020.1.0: 2020/01/23
 ---------------------