srcprefix: positional arg -> keyword arg

Author: sue445

_gem/lib/go_gem/mkmf.rb

@@ -17,7 +17,7 @@ module Mkmf
     #   # Use create_go_makefile instead of create_makefile
     #   # create_makefile("example/example")
     #   create_go_makefile("example/example")
-    def create_go_makefile(target, srcprefix = nil)
+    def create_go_makefile(target, srcprefix: nil)
       find_executable("go")
 
       # rubocop:disable Style/GlobalVars

_gem/sig/go_gem/mkmf.rbs

@@ -2,6 +2,6 @@ module GoGem
   module Mkmf
     $objs: Array[untyped]
 
-    def create_go_makefile: (String target, String? srcprefix) -> void
+    def create_go_makefile: (String target, ?srcprefix: String?) -> void
   end
 end