Prep for v0.15.6 (#167)

Author: odow

Project.toml

@@ -1,7 +1,7 @@
 name = "MosekTools"
 uuid = "1ec41992-ff65-5c91-ac43-2df89e9693a4"
 repo = "https://github.com/jump-dev/MosekTools.jl.git"
-version = "0.15.5"
+version = "0.15.6"
 
 [deps]
 MathOptInterface = "b8f27783-ece8-5eb3-8dc8-9495eed66fee"