Release notes for 3.2.0 release

Author: jcoliz

RELEASE_NOTES.md

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+## 3.2.0 - May 10 2022
+* Removes needless constraint on 0-value inputs to FV & PMT functions. (PR #67)
+
 ## 3.1.0 - Dec 20 2021
 * Adds PDURATION function. Returns the number of periods required by an investment to reach a specified value. (Resolves #62)
 * Adds RRI function. Also used for CAGR. Returns an equivalent interest rate for the growth of an investment. (Resolves #60)