updated RELEASE-NOTES.md (#3838)

* updated RELEASE-NOTES.md Added the deprecation of `sd` with `sigma` in newer version with DeprecationWarning on usage of `sd`. * Update RELEASE-NOTES.md
pymc-devs · Mar 19, 2020 · 363afc8 · 363afc8
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 ### Maintenance
 - Remove `sample_ppc` and `sample_ppc_w` that were deprecated in 3.6.
 - Tuning results no longer leak into sequentially sampled `Metropolis` chains (see #3733 and #3796).
+- Deprecated `sd` in version 3.7 has been replaced by `sigma` now raises `DepreciationWarning` on using `sd` in continuous, mixed and timeseries distributions. (see #3837 and #3688).
 
 ## PyMC3 3.8 (November 29 2019)