reset generated flags changes

generate-flag-types

@@ -143,7 +143,6 @@ def _write_cli_flag_types(outfile, types):
             Usage string
             EnvVar string
             FilePath string
-            Required bool
             Hidden bool
         """.format(**typedef))
 
@@ -171,11 +170,6 @@ def _write_cli_flag_types(outfile, types):
                 return f.Name
             }}
 
-            // IsRequired returns the whether or not the flag is required
-            func (f {name}Flag) IsRequired() bool {{
-                return f.Required
-            }}
-
             // {name} looks up the value of a local {name}Flag, returns
             // {context_default} if not found
             func (c *Context) {name}(name string) {context_type} {{