More spec compliant HTML template (facebook#2914)

Hurtak · SpaceK33z · commit b9351c938549 · 2017-09-29T12:17:30.000+02:00
Changed

`&lt;!doctype html&gt;`

to

`&lt;!DOCTYPE html&gt;`

According to the spec it should be uppercase (but parsing is case insensitive)
diff --git a/packages/react-scripts/template/public/index.html b/packages/react-scripts/template/public/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
   <head>
     <meta charset="utf-8">
