Bump version to 5.1.0

Author: rafalcymerys

lib/spree_i18n/version.rb

@@ -9,8 +9,8 @@ def version
 
   module Version
     MAJOR = 5
-    MINOR = 0
-    TINY  = 1
+    MINOR = 1
+    TINY  = 0
 
     STRING = [MAJOR, MINOR, TINY].compact.join('.')
   end