Minor capitalization correction for GitHub in README (#787)

README.md

@@ -61,14 +61,14 @@ Preact supports modern browsers and IE9+:
 ## Demos
 
 - [**ESBench**](http://esbench.com) is built using Preact.
-- [**Nectarine.rocks**](http://nectarine.rocks) _([Github Project](https://github.com/developit/nectarine))_ :peach:
-- [**Documentation Viewer**](https://documentation-viewer.firebaseapp.com) _([Github Project](https://github.com/developit/documentation-viewer))_
-- [**TodoMVC**](https://preact-todomvc.surge.sh) _([Github Project](https://github.com/developit/preact-todomvc))_
-- [**Hacker News Minimal**](https://developit.github.io/hn_minimal/) _([Github Project](https://github.com/developit/hn_minimal))_
-- [**Preact Boilerplate**](https://preact-boilerplate.surge.sh) _([Github Project](https://github.com/developit/preact-boilerplate))_ :zap:
-- [**Preact Offline Starter**](https://preact-starter.now.sh) _([Github Project](https://github.com/lukeed/preact-starter))_ :100:
-- [**Preact PWA**](https://preact-pwa.appspot.com/) _([Github Project](https://github.com/ezekielchentnik/preact-pwa))_ :hamburger:
-- [**Preact Mobx Starter**](https://awaw00.github.io/preact-mobx-starter/) _([Github Project](https://github.com/awaw00/preact-mobx-starter))_ :sunny:
+- [**Nectarine.rocks**](http://nectarine.rocks) _([GitHub Project](https://github.com/developit/nectarine))_ :peach:
+- [**Documentation Viewer**](https://documentation-viewer.firebaseapp.com) _([GitHub Project](https://github.com/developit/documentation-viewer))_
+- [**TodoMVC**](https://preact-todomvc.surge.sh) _([GitHub Project](https://github.com/developit/preact-todomvc))_
+- [**Hacker News Minimal**](https://developit.github.io/hn_minimal/) _([GitHub Project](https://github.com/developit/hn_minimal))_
+- [**Preact Boilerplate**](https://preact-boilerplate.surge.sh) _([GitHub Project](https://github.com/developit/preact-boilerplate))_ :zap:
+- [**Preact Offline Starter**](https://preact-starter.now.sh) _([GitHub Project](https://github.com/lukeed/preact-starter))_ :100:
+- [**Preact PWA**](https://preact-pwa.appspot.com/) _([GitHub Project](https://github.com/ezekielchentnik/preact-pwa))_ :hamburger:
+- [**Preact Mobx Starter**](https://awaw00.github.io/preact-mobx-starter/) _([GitHub Project](https://github.com/awaw00/preact-mobx-starter))_ :sunny:
 - [**Preact Redux Example**](https://github.com/developit/preact-redux-example) :star:
 - [**Flickr Browser**](http://codepen.io/developit/full/VvMZwK/) (@ CodePen)
 - [**Animating Text**](http://codepen.io/developit/full/LpNOdm/) (@ CodePen)
@@ -78,13 +78,13 @@ Preact supports modern browsers and IE9+:
 - [**Stock Ticker**](http://codepen.io/developit/pen/wMYoBb?editors=0010) (@ CodePen)
 - [**Create your Own!**](https://jsfiddle.net/developit/rs6zrh5f/embedded/result/) (@ JSFiddle)
 - [**Preact Coffeescript**](https://github.com/crisward/preact-coffee)
-- [**GuriVR**](https://gurivr.com) _([Github Project](https://github.com/opennewslabs/guri-vr))_
+- [**GuriVR**](https://gurivr.com) _([GitHub Project](https://github.com/opennewslabs/guri-vr))_
 - [**V2EX Preact**](https://github.com/yanni4night/v2ex-preact)
-- [**BigWebQuiz**](https://bigwebquiz.com/) _([Github Project](https://github.com/jakearchibald/big-web-quiz))_
-- [**Color Picker**](https://colors.now.sh) _([Github Project](https://github.com/lukeed/colors-app))_ :art:
-- [**Rainbow Explorer**](https://use-the-platform.com/rainbow-explorer/) _([Github Project](https://github.com/vaneenige/rainbow-explorer/))_ :rainbow:
-- [**Offline Gallery**](https://use-the-platform.com/offline-gallery/) _([Github Project](https://github.com/vaneenige/offline-gallery/))_ :balloon:
-- [**Periodic Weather**](https://use-the-platform.com/periodic-weather/) _([Github Project](https://github.com/vaneenige/periodic-weather/))_ :sunny:
+- [**BigWebQuiz**](https://bigwebquiz.com/) _([GitHub Project](https://github.com/jakearchibald/big-web-quiz))_
+- [**Color Picker**](https://colors.now.sh) _([GitHub Project](https://github.com/lukeed/colors-app))_ :art:
+- [**Rainbow Explorer**](https://use-the-platform.com/rainbow-explorer/) _([GitHub Project](https://github.com/vaneenige/rainbow-explorer/))_ :rainbow:
+- [**Offline Gallery**](https://use-the-platform.com/offline-gallery/) _([GitHub Project](https://github.com/vaneenige/offline-gallery/))_ :balloon:
+- [**Periodic Weather**](https://use-the-platform.com/periodic-weather/) _([GitHub Project](https://github.com/vaneenige/periodic-weather/))_ :sunny:
 - [**Play.cash**](https://play.cash) :notes:
 
 ## Libraries & Add-ons
@@ -466,7 +466,7 @@ Support us with a monthly donation and help us continue our activities. [[Become
 
 
 ## Sponsors
-Become a sponsor and get your logo on our README on Github with a link to your site. [[Become a sponsor](https://opencollective.com/preact#sponsor)]
+Become a sponsor and get your logo on our README on GitHub with a link to your site. [[Become a sponsor](https://opencollective.com/preact#sponsor)]
 
 <a href="https://opencollective.com/preact/sponsor/0/website" target="_blank"><img src="https://opencollective.com/preact/sponsor/0/avatar.svg"></a>
 <a href="https://opencollective.com/preact/sponsor/1/website" target="_blank"><img src="https://opencollective.com/preact/sponsor/1/avatar.svg"></a>