Update Changelog.md
Update Changelog.md

Removed additional indentation in one line which made it look like a
"code" block in markdown.
skbkontur/NuGetGallery,ScottShingler/NuGetGallery,mtian/SiteExtensionGallery,mtian/SiteExtensionGallery,ScottShingler/NuGetGallery,KuduApps/NuGetGallery,JetBrains/ReSharperGallery,ScottShingler/NuGetGallery,grenade/NuGetGallery_download-count-patch,KuduApps/NuGetGallery,grenade/NuGetGallery_download-count-patch,skbkontur/NuGetGallery,projectkudu/SiteExtensionGallery,mtian/SiteExtensionGallery,projectkudu/SiteExtensionGallery,KuduApps/NuGetGallery,JetBrains/ReSharperGallery,JetBrains/ReSharperGallery,grenade/NuGetGallery_download-count-patch,projectkudu/SiteExtensionGallery,KuduApps/NuGetGallery,skbkontur/NuGetGallery,KuduApps/NuGetGallery