I am using shivas/versionig-bundle for the first time and the default starter version number is 0.1.0 but I need starter version 1.0.0a
How can I format the number of version?
according to the default readme of that bundle, the version is determined by:
VersionProvider (read the version from a VERSION file)
GitRepositoryProvider (git tag describe provider to automatically update the version by looking at git tags)
RevisionProvider (read the version from a REVISION file)
InitialVersionProvider (just returns the default initial version 0.1.0)
So I guess you could - for example - add a VERSION file. And maybe RTFM.