update CHANGELOG date - so we could release balance 0.5.0

Summary: NA

Reviewed By: SarigT

Differential Revision: D43834451

fbshipit-source-id: decb4061511bf6c6b9d4f655e94ddfcdceeb8995

CHANGELOG.md

@@ -1,4 +1,4 @@
-0.5.0 (the future)
+0.5.0 (2023-03-06)
 ==================
 ### New Features
 - The `datasets.load_data` function now also supports the input "sim_data_cbps", which loads the simulated data used in the CBPS R vs Python tutorial. It is also used in unit-testing to compare the CBPS weights produced from Python (i.e.: balance) with R (i.e.: the CBPS package). The testing shows how the correlation of the weights from the two implementations (both Pearson and Spearman) produce a correlation of >0.98.