Merge branch 'branch-0.4.0' into 'branch-0.4.0'

milvus default version 0.4.0

See merge request megasearch/milvus!349

Former-commit-id: 7d970111cd247bbb2d3fc75fc16fcd32fbe3f73f

cpp/CMakeLists.txt

@@ -52,7 +52,7 @@ if(MILVUS_VERSION_MAJOR STREQUAL ""
         OR MILVUS_VERSION_MINOR STREQUAL ""
         OR MILVUS_VERSION_PATCH STREQUAL "")
     message(WARNING "Failed to determine Milvus version from git branch name")
-    set(MILVUS_VERSION "0.3.1")
+    set(MILVUS_VERSION "0.4.0")
 endif()
 
 message(STATUS "Build version = ${MILVUS_VERSION}")