[console] Tag 1.0.0-rc12 release. (#3040)

Author: jmolivas

composer.json

@@ -37,9 +37,9 @@
     },
     "require": {
         "php": "^5.5.9 || ^7.0",
+        "drupal/console-core" : "1.0.0-rc12",
         "alchemy/zippy": "0.3.5",
         "composer/installers": "~1.0",
-        "drupal/console-core" : "~1.0",
         "symfony/css-selector": ">=2.7 <3.2",
         "symfony/dom-crawler": ">=2.7 <3.2",
         "symfony/http-foundation": ">=2.7 <3.2",