Fix issue with renaming the dSYM file

Renaming the dSYM package would file if one with the same name would
already exist at the destination.
The previous one is now deleted before renaming.
Update version to 1.3.8
Merge branch 'release/1.3.8'
Merge tag 'ios-maven-plugin-1.3.8' into develop

Create tag 1.3.8
Update version to 1.3.9-SNAPSHOT