Merge branch 'branch-0.3.1' into 'branch-0.3.1'

MS-248 update changelog

See merge request megasearch/milvus!242

Former-commit-id: 9acd9b7209f81e36c4b7ee7bcea4a4075eb41549

cpp/CHANGELOG.md

@@ -31,6 +31,7 @@ Please mark all change in change log and use the ticket from JIRA.
 - MS-241 - Build Faiss with MKL if using Intel CPU; else build with OpenBlas
 - MS-242 - Clean up cmake and change MAKE_BUILD_ARGS to be user defined variable
 - MS-245 - Improve search result transfer performance
+- MS-248 - Support AddVector/SearchVector profiling
 
 ## New Feature
 - MS-180 - Add new mem manager