Bump version for release
Bump version for release

Bump version to 2.4.0 for release of vSphere 7.0 calls.

Signed-off-by: J.R. Garcia <837382919d8fe61d4198de0c3cb7269cb0eb414f@vmware.com>

vmware/rbvmomi,10xEngineer/rbvmomi,10xEngineer/rbvmomi