More inclusive README

Replace 'you guys' by something more gender neutral.

README.md

@@ -77,7 +77,7 @@ Git is a very powerful distributed version-control system - and it can be used t
 
 ### I'm a developer
 
-So, you're one of these amazing folks making all of this possible? We love you guys! As a developer we recommend you to clone [Pico's Git repository][PicoGit] as well as the Git repositories of [Pico's default theme][PicoThemeGit] and the [`PicoDeprecated` plugin][PicoDeprecatedGit]. You can set up your workspace using [Pico's Composer starter project][PicoComposerGit] and include all of Pico's components using local packages.
+So, you're one of these amazing people making all of this possible? We love you folks! As a developer we recommend you to clone [Pico's Git repository][PicoGit] as well as the Git repositories of [Pico's default theme][PicoThemeGit] and the [`PicoDeprecated` plugin][PicoDeprecatedGit]. You can set up your workspace using [Pico's Composer starter project][PicoComposerGit] and include all of Pico's components using local packages.
 
 Using Pico's Git repositories is different from using one of the installation methods elucidated above. It gives you the current development version of Pico, what is likely *unstable* and *not ready for production use*!
 
@@ -198,7 +198,7 @@ Contributing
 
 You want to contribute to Pico? We really appreciate that! You can help make Pico better by [contributing code][PullRequests] or [reporting issues][Issues], but please take note of our [contribution guidelines][ContributionGuidelines]. In general you can contribute in three different areas:
 
-1. Plugins & Themes: You're a plugin developer or theme designer? We love you guys! You can find tons of information about how to develop plugins and themes at http://picocms.org/development/. If you have created a plugin or theme, please add it to our [Wiki][], either on the [plugins][WikiPlugins] or [themes][WikiThemes] page. You may also [Submit][] it to our website, where it'll be displayed on the official [plugin][OfficialPlugins] or [theme][OfficialThemes] pages!
+1. Plugins & Themes: You're a plugin developer or theme designer? We love you folks! You can find tons of information about how to develop plugins and themes at http://picocms.org/development/. If you have created a plugin or theme, please add it to our [Wiki][], either on the [plugins][WikiPlugins] or [themes][WikiThemes] page. You may also [Submit][] it to our website, where it'll be displayed on the official [plugin][OfficialPlugins] or [theme][OfficialThemes] pages!
 
 2. Documentation: We always appreciate people improving our documentation. You can either improve the [inline user docs][EditInlineDocs] or the more extensive [user docs on our website][EditUserDocs]. You can also improve the [docs for plugin and theme developers][EditDevDocs]. Simply fork our website's Git repository from https://github.com/picocms/picocms.github.io, change the Markdown files and open a [pull request][PullRequestsWebsite].