bump patch version to 0.5.7

Author: rafaqz

Project.toml

@@ -1,7 +1,7 @@
 name = "RasterDataSources"
 uuid = "3cb90ccd-e1b6-4867-9617-4276c8b2ca36"
 authors = ["Rafael Schouten <rafaelschouten@gmail.com>", "Timothée Poisot <timothee.poisot@umontreal.ca>"]
-version = "0.5.6"
+version = "0.5.7"
 
 [deps]
 ASCIIrasters = "81770e7c-c736-4fa5-8129-46dd21831640"