modified the Optimal_Clusters_GMM() related to #45

DESCRIPTION

@@ -1,8 +1,8 @@
 Package: ClusterR
 Type: Package
 Title: Gaussian Mixture Models, K-Means, Mini-Batch-Kmeans, K-Medoids and Affinity Propagation Clustering
-Version: 1.3.0
-Date: 2023-01-21
+Version: 1.3.1
+Date: 2023-02-01
 Authors@R: c( person(given = "Lampros", family = "Mouselimis", email = "[email protected]", role = c("aut", "cre"), comment = c(ORCID = "https://orcid.org/0000-0002-8024-1546")), person(given = "Conrad", family = "Sanderson", role = "cph", comment = "Author of the C++ Armadillo library"), person(given = "Ryan", family = "Curtin", role = "cph", comment = "Author of the C++ Armadillo library"), person(given = "Siddharth", family = "Agrawal", role = "cph", comment = "Author of the C code of the Mini-Batch-Kmeans algorithm (https://github.com/siddharth-agrawal/Mini-Batch-K-Means)"), person(given = "Brendan", family = "Frey", email = "[email protected]", role = "cph", comment = "Author of the matlab code of the Affinity propagation algorithm (for commercial use please contact the author of the matlab code)"), person(given = "Delbert", family = "Dueck", role = "cph", comment = "Author of the matlab code of the Affinity propagation algorithm"), person(given = "Vitalie", family = "Spinu", email = "[email protected]", role = "ctb", comment = c(Github = "Github Contributor")) )  
 Maintainer: Lampros Mouselimis <[email protected]>
 BugReports: https://github.com/mlampros/ClusterR/issues

NEWS.md

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+## Cluster 1.3.1
+
+* I fixed a mistake related to a potential warning of the *'Optimal_Clusters_GMM()'* function (see issue: https://github.com/mlampros/ClusterR/issues/45)
+
+
 ## Cluster 1.3.0
 
 * I updated the documentation of the *'Optimal_Clusters_KMeans()'* function related to the *'silhouette'* metric (see issue: https://github.com/mlampros/ClusterR/issues/42)