Preparing CHANGELOG notes

Author: Ivan De Marino

.changelog/32.txt

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+```release-note:breaking-change
+Renaming package `validatordiag` to be at `helpers/validatordiag`.
+```
+
+```release-note:feature
+Introduced `schemavalidator` package with 4 new validation functions: `RequiredWith()`, `ConflictsWith()`, `AtLeastOneOf()`, `ExactlyOneOf()`.
+```
+
+```release-note:feature
+Introduced `helpers/attributepath`, useful when needing to print out in a practitioner-friendly format instanceas of `tftypes.AttributePath`.
+```