Spark version bump in release notes

Signed-off-by: Jason T. Brown <jason@astraea.earth>

Author: vpipkt

docs/src/main/paradox/release-notes.md

@@ -4,6 +4,7 @@
 
 ### 0.9.1
 
+* Upgraded to Spark 2.4.7
 * Added `method_name` parameter to the `rf_resample` method.
    * __BREAKING__: In SQL, the function `rf_resample` now takes 3 arguments. You can use `rf_resample_nearest` with two arguments or refactor to `rf_resample(t, v, "nearest")`.
 * Added resample method parameter to SQL and Python APIs. @ref:[See updated docs](raster-join.md).