chore: update history.md for v9.15.0

Author: doug-martin

HISTORY.md

@@ -1,3 +1,6 @@
+# v9.15.0
+* [FEATURE] Add SetDefaultPrepared which controls query value interpolation [#288](https://github.com/doug-martin/goqu/pull/288) - [@Deiz](https://github.com/Deiz)
+
 # v9.14.0
 * [FEATURE] GroupByAppend to the SelectDataset and SelectClauses [#276](https://github.com/doug-martin/goqu/pull/276), [#287](https://github.com/doug-martin/goqu/pull/287) - [@ashishkf](https://github.com/ashishkf)
 * [FEATURE] Allow untagged fields to be ignored [#285](https://github.com/doug-martin/goqu/pull/285) - [@Deiz](https://github.com/Deiz)