Fix timezone handling on Windows

- Replace non-standard Switzerland/Geneva timezone by Europe/paris

Author: jouvin

Gemfile

@@ -1,8 +1,11 @@
 source "https://rubygems.org"
 
 gem 'jekyll-feed'
-gem "github-pages"
+gem "github-pages", ">= 150"
 gem "html-proofer"
 
 # Suggested by Jekyll
 gem 'wdm', '>= 0.1.0' if Gem.win_platform?
+
+# Required on Windows for recent versions (>= 3.6) of Jekyll
+gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw]

_config.yml

@@ -2,7 +2,7 @@ name: HEP Software Foundation Newsletter
 description: News from the HEP Software Foundation
 url: http://www.hepsoftwarefoundation.org
 excerpt_separator: <!--more-->
-timezone: Switzerland/Geneva
+timezone: Europe/Paris
 highlighter: rouge
 markdown: kramdown
 future: true