releaser: Add release notes to /docs for release of 0.57.2

[ci skip]

Author: bep

content/en/news/0.57.2-relnotes/index.md

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+---
+date: 2019-08-17
+title: "Hugo 0.57.2: A couple of Bug Fixes"
+description: "This version fixes a couple of bugs introduced in 0.57.0."
+categories: ["Releases"]
+images:
+- images/blog/hugo-bug-poster.png
+
+---
+
+	
+
+This is a bug-fix release with a couple of important fixes.
+
+* tpl: Use RegularPages for RSS template [88d69936](https://github.com/gohugoio/hugo/commit/88d69936122f82fffc02850516bdb37be3d0892b) [@bep](https://github.com/bep) [#6238](https://github.com/gohugoio/hugo/issues/6238)
+* hugolib: Don't use the global warning logger [ea681603](https://github.com/gohugoio/hugo/commit/ea6816030081b2cffa6c0ae9ca5429a2c6fe2fa5) [@bep](https://github.com/bep) [#6238](https://github.com/gohugoio/hugo/issues/6238)
+* tpl: Avoid "home page warning" in RSS template [564cf1bb](https://github.com/gohugoio/hugo/commit/564cf1bb11e100891992e9131b271a79ea7fc528) [@bep](https://github.com/bep) [#6238](https://github.com/gohugoio/hugo/issues/6238)
+* hugolib: Allow index.md inside bundles [4b4bdcfe](https://github.com/gohugoio/hugo/commit/4b4bdcfe740d988e4cfb4fee53eced6985576abd) [@bep](https://github.com/bep) [#6208](https://github.com/gohugoio/hugo/issues/6208)
+* Adjust the default paginator for sections [18836a71](https://github.com/gohugoio/hugo/commit/18836a71ce7b671fa71dd1318b99fc661755e94d) [@bep](https://github.com/bep) [#6231](https://github.com/gohugoio/hugo/issues/6231)
+* hugolib: Add a site benchmark [416493b5](https://github.com/gohugoio/hugo/commit/416493b548a9bbaa27758fba9bab50a22b680e9d) [@bep](https://github.com/bep) 
+* Update to Go 1.11.13 and 1.12.9 [f28efd35](https://github.com/gohugoio/hugo/commit/f28efd35820dc4909832c14dfd8ea6812ecead31) [@bep](https://github.com/bep) [#6228](https://github.com/gohugoio/hugo/issues/6228)
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+
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