Update version number to 1.2.0 according to Bioconductor instruction (2021-06-10)
+ Submitted to Bioconductor

Changes in version 0.2.0 (2021-01-10)
+ Added new Vignettes "community structure inference"

Release version 0.2.0 (2020-12-04)
+ Buidling website. 
+ Made the following changes
  o Kernel method
  o Adding tutorials
