docs: fix boast link in s2o README.md

Author: MikeRalphson

packages/swagger2openapi/README.md

@@ -72,7 +72,7 @@ converter.convertObj(swagger, options, function(err, options){
 
 Note that the `options` object passed in is modified/extended by the `convert*` functions.
 
-See the [boast command-line tool](./boast.js) for a fuller CLI tool for converting, validating and linting.
+See the [boast command-line tool](/packages/swagger2openapi/boast.js) for a fuller CLI tool for converting, validating and linting.
 
 See here for complete [documentation](/docs/options.md) of the `options` object.