changes in versionn 0.99.3 (2020-21-07)
+ implementing imagePaths in VisiumExperiment class
+ SpatialExperiment can now be created also without spatial coordinates
changes in versionn 0.99.2 (2020-17-07)
+ adding version 0.99.2
changes in versionn 0.99.1 (2020-09-07)
+ adding version 0.99.1