Set version to 0.1.2

Author: github-actions[bot]

Project.toml

@@ -1,7 +1,7 @@
 name = "MultilayerGraphs"
 uuid = "af984530-d72f-4904-8b81-b992bbbeaf3f"
 authors = ["Claudio Moroni <43729990+ClaudMor@users.noreply.github.com>", "Pietro Monticone <38562595+pitmonticone@users.noreply.github.com>"]
-version = "0.1.1"
+version = "0.1.2"
 
 [deps]
 DataStructures = "864edb3b-99cc-5e75-8d2d-829cb0a9cfe8"