Add pronto-{checkstyle,findbugs} to README.md (prontolabs#345)

README.md

@@ -280,6 +280,7 @@ Currently available:
 * [pronto-blacklist](https://github.com/pbstriker38/pronto-blacklist)
 * [pronto-brakeman](https://github.com/prontolabs/pronto-brakeman)
 * [pronto-bundler_audit](https://github.com/pdobb/pronto-bundler_audit)
+* [pronto-checkstyle](https://github.com/seikichi/pronto-checkstyle)
 * [pronto-coffeelint](https://github.com/siebertm/pronto-coffeelint)
 * [pronto-clang_format](https://github.com/micjabbour/pronto-clang_format)
 * [pronto-clang_tidy](https://github.com/micjabbour/pronto-clang_tidy)
@@ -293,6 +294,7 @@ Currently available:
 * [pronto-eslint](https://github.com/prontolabs/pronto-eslint) (uses [eslintrb](https://github.com/zendesk/eslintrb))
 * [pronto-eslint_npm](https://github.com/doits/pronto-eslint_npm) (uses eslint installed from npm)
 * [pronto-fasterer](https://github.com/prontolabs/pronto-fasterer)
+* [pronto-findbugs](https://github.com/seikichi/pronto-findbugs)
 * [pronto-flake8](https://github.com/scoremedia/pronto-flake8)
 * [pronto-flay](https://github.com/prontolabs/pronto-flay)
 * [pronto-flow](https://github.com/kevinjalbert/pronto-flow)