fix(generator): can't infer generic type

src/awesomewm.d.tl/generator/snippets.tl

@@ -30,7 +30,7 @@ end
 function snippets.render_requires(requires: Map<string, string>): string
    local tmpl = [[local $(name) = require "$(path)"]]
 
-   local require_statements <const> = List()
+   local require_statements <const>: List<string> = List()
    for name, path in requires:iter() do
       local tmpl_args = {
          name = name,