sbm 0.2.1 - minor release

• various bug fixes, especially for directed network in Simple SBM, covariates for Bipartite LBM
• tests for consistency amended to hopefully avoid random errors on CRAN
• tests for covariates and directed networks
• tests for S3 methods (coef, fitted, predict)

sbm 0.2.0 - first CRAN release

• Support for Simple and Bipartite SBM, undirected and directed with Bernoulli, Poisson and Gaussian emission law of the edges
• Added a NEWS.md file to track changes to the package.