Fix failing tests due to Mustache dependency conflict (#280)

Author: swissspidy

README.md

@@ -53,7 +53,7 @@ WP-CLI `packages/local/` directory.
 	[--require_wp_cli=<version>]
 		Required WP-CLI version for the package.
 		---
-		default: ^2.12
+		default: ^2.13
 		---
 
 	[--require_wp_cli_tests=<version>]

features/scaffold-package-readme.feature

@@ -40,7 +40,7 @@ Feature: Scaffold a README.md file for an existing package
     And the {PACKAGE_PATH}/local/wp-cli/default-readme/README.md file should exist
     And the {PACKAGE_PATH}/local/wp-cli/default-readme/README.md file should contain:
       """
-      Installing this package requires WP-CLI v2.12 or greater. Update to the latest stable release with `wp cli update`.
+      Installing this package requires WP-CLI v2.13 or greater. Update to the latest stable release with `wp cli update`.
       """
     And the {PACKAGE_PATH}/local/wp-cli/default-readme/README.md file should contain:
       """
@@ -76,7 +76,7 @@ Feature: Scaffold a README.md file for an existing package
     And the {PACKAGE_PATH}/local/wp-cli/custom-branch/README.md file should exist
     And the {PACKAGE_PATH}/local/wp-cli/custom-branch/README.md file should contain:
       """
-      Installing this package requires WP-CLI v2.12 or greater. Update to the latest stable release with `wp cli update`.
+      Installing this package requires WP-CLI v2.13 or greater. Update to the latest stable release with `wp cli update`.
       """
     And the {PACKAGE_PATH}/local/wp-cli/custom-branch/README.md file should contain:
       """
@@ -152,7 +152,7 @@ Feature: Scaffold a README.md file for an existing package
               "files": [ "command.php" ]
           },
           "require": {
-              "wp-cli/wp-cli": "^2.12"
+              "wp-cli/wp-cli": "^2.13"
           },
           "require-dev": {
               "wp-cli/wp-cli-tests": "^5.0.0"
@@ -367,7 +367,7 @@ Feature: Scaffold a README.md file for an existing package
               "files": [ "command.php" ]
           },
           "require": {
-              "wp-cli/wp-cli": "^2.12"
+              "wp-cli/wp-cli": "^2.13"
           },
           "require-dev": {
               "wp-cli/wp-cli-tests": "^5.0.0"

features/scaffold-package.feature

@@ -43,7 +43,7 @@ Feature: Scaffold WP-CLI commands
     And the {PACKAGE_PATH}/local/wp-cli/foo/composer.json file should contain:
       """
           "require": {
-              "wp-cli/wp-cli": "^2.12"
+              "wp-cli/wp-cli": "^2.13"
           },
       """
     And the {PACKAGE_PATH}/local/wp-cli/foo/hello-world-command.php file should exist

src/ScaffoldPackageCommand.php

@@ -47,7 +47,7 @@ class ScaffoldPackageCommand {
 	 * [--require_wp_cli=<version>]
 	 * : Required WP-CLI version for the package.
 	 * ---
-	 * default: ^2.12
+	 * default: ^2.13
 	 * ---
 	 *
 	 * [--require_wp_cli_tests=<version>]