Bump to version 0.4.2

Also make Julia min version 1.3

Author: simonschoelly

Project.toml

@@ -1,7 +1,7 @@
 name = "LightGraphsFlows"
 uuid = "2f5eb75a-258c-59e0-affc-f41c55f75335"
 authors = ["Mathieu Besançon <mathieu.besancon@gmail.com>"]
-version = "0.4.1"
+version = "0.4.2"
 
 [deps]
 JuMP = "4076af6c-e467-56ae-b986-b466b2749572"
@@ -15,7 +15,7 @@ SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
 JuMP = "0.21"
 LightGraphs = "1.3"
 SimpleTraits = "0.9"
-julia = "1"
+julia = "1.3"
 
 [extras]
 GLPK = "60bf3e95-4087-53dc-ae20-288a0d20c6a6"