docs: Add cli option to README

Author: danez

README.md

@@ -45,6 +45,7 @@ Options:
    -i, --ignore          Folders to ignore. Default:  [node_modules,__tests__,__mocks__]
    --resolver RESOLVER   Resolver name (findAllComponentDefinitions, findExportedComponentDefinition) or
       path to a module that exports a resolver.  [findExportedComponentDefinition]
+   --legacy-decorators   Switch parsing to support only the legacy decorators syntax
 
 Extract meta information from React components.
 If a directory is passed, it is recursively traversed.
@@ -83,7 +84,7 @@ As with the CLI, this will look for the exported component created through `Reac
 | source       | string | The source text |
 | resolver     | function | A function of the form `(ast: ASTNode, recast: Object) => (NodePath|Array<NodePath>)`. Given an AST and a reference to recast, it returns an (array of) NodePath which represents the component definition. |
 | handlers     | Array\<function\> | An array of functions of the form `(documentation: Documentation, definition: NodePath) => void`. Each function is called with a `Documentation` object and a reference to the component definition as returned by `resolver`. Handlers extract relevant information from the definition and augment `documentation`. |
-| options      | Pass options to react-docgen. Supported option is `legacyDecorators` which is a boolean |
+| options      | Object | Pass options to react-docgen. Supported option is `legacyDecorators` which is a boolean |
 
 #### resolver