Add True/False to dial (#707)

For languages like Python.

lua/lv-dial/init.lua

@@ -17,6 +17,14 @@ vmap g<C-x> <Plug>(dial-decrement-additional)
     strlist = { "true", "false" },
   }
   table.insert(dial.config.searchlist.normal, "custom#boolean")
+
+  -- For Languages which prefer True/False, e.g. python.
+  dial.augends["custom#Boolean"] = dial.common.enum_cyclic {
+    name = "Boolean",
+    strlist = { "True", "False" },
+  }
+  table.insert(dial.config.searchlist.normal, "custom#Boolean")
+
 end
 
 return M