Blockbase: update theme meta per theme review feedback (#3998)

* Minor version for requires php and add license URI.

* Update the License URI to raw.

blockbase/style.css

@@ -6,10 +6,10 @@ Author URI: https://automattic.com/
 Description: Blockbase is a simple theme that supports full-site editing. It comes with a set of minimal templates and design settings that can be manipulated through Global Styles. Use it to build something beautiful.
 Requires at least: 5.7
 Tested up to: 5.7
-Requires PHP: 5.6.2
-Version: 1.0.1
+Requires PHP: 5.7
+Version: 1.0.2
 License: GNU General Public License v2 or later
-License URI: LICENSE
+License URI: https://raw.githubusercontent.com/Automattic/themes/trunk/LICENSE 
 Text Domain: blockbase
 Tags: one-column, block-styles, custom-menu, custom-logo, editor-style, featured-images, full-site-editing, rtl-language-support, threaded-comments, wide-blocks