Prepare for 1.6.0 release (#990)

* Set changelog and readme version to prepare for 1.6.0 release

* Bump tested up to versions: WP 5.5 and WC 4.6

changelog.txt

@@ -1,6 +1,6 @@
 *** WooCommerce Payments Changelog ***
 
-= 1.x.x - 2020-xx-xx =
+= 1.6.0 - 2020-xx-xx =
 * Fix - Trimming the whitespace when updating the bank statement descriptor.
 * Add - Initial support for the checkout block.
 * Add - Support wp_get_environment_type() and enable dev-mode when environment is 'development' or 'staging'.

readme.txt

@@ -2,7 +2,7 @@
 Contributors: woocommerce, automattic
 Tags: woocommerce, payment, payment request, credit card, automattic
 Requires at least: 5.3
-Tested up to: 5.4
+Tested up to: 5.5
 Requires PHP: 7.0
 Stable tag: 1.5.0
 License: GPLv2 or later
@@ -101,7 +101,7 @@ Please note that our support for the checkout block is still experimental and th
 
 == Changelog ==
 
-= 1.x.x - 2020-xx-xx =
+= 1.6.0 - 2020-xx-xx =
 * Fix - Trimming the whitespace when updating the bank statement descriptor.
 * Add - Initial support for the checkout block.
 * Add - Support wp_get_environment_type() and enable dev-mode when environment is 'development' or 'staging'.

woocommerce-payments.php

@@ -8,7 +8,7 @@
  * Text Domain: woocommerce-payments
  * Domain Path: /languages
  * WC requires at least: 4.0
- * WC tested up to: 4.4
+ * WC tested up to: 4.6
  * Requires WP: 5.3
  * Version: 1.5.0
  *