Update Vue mastery banner copy after promotion (#1017)

* chore(deps): bump ssri from 6.0.1 to 6.0.2

Bumps [ssri](https://github.com/npm/ssri) from 6.0.1 to 6.0.2.
- [Release notes](https://github.com/npm/ssri/releases)
- [Changelog](https://github.com/npm/ssri/blob/v6.0.2/CHANGELOG.md)
- [Commits](npm/ssri@v6.0.1...v6.0.2)

Signed-off-by: dependabot[bot] <support@github.com>

* Update Vue mastery banner copy after promotion

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: pieer

src/.vuepress/theme/components/sponsors/VueMasteryBanner.vue

@@ -3,8 +3,8 @@
   <a href="https://www.vuemastery.com/free-weekend" target="_blank">
     <div class="vuemastery-banner--wrapper">
       <img class="vuemastery-banner--logo" src="/images/vuemastery/logo-vuemastery.svg" alt="vuemastery" />
-      <p><span>Watch all Vue Mastery courses</span>Free all weekend on April 23-25</p>
-      <button class="vuemastery-button">Register now</button>
+      <p><span>Save 35% off</span> a year of Vue courses</p>
+      <button class="vuemastery-button">Get access</button>
     </div>
     <div id="vm-close" class="vuemastery-banner--close" @click.prevent="$emit('close-banner')"></div>
   </a>

yarn.lock

@@ -7192,9 +7192,9 @@ sshpk@^1.7.0:
     tweetnacl "~0.14.0"
 
 ssri@^6.0.1:
-  version "6.0.1"
-  resolved "https://registry.yarnpkg.com/ssri/-/ssri-6.0.1.tgz#2a3c41b28dd45b62b63676ecb74001265ae9edd8"
-  integrity sha512-3Wge10hNcT1Kur4PDFwEieXSCMCJs/7WvSACcrMYrNp+b8kDL1/0wJch5Ni2WrtwEa2IO8OsVfeKIciKCDx/QA==
+  version "6.0.2"
+  resolved "https://registry.yarnpkg.com/ssri/-/ssri-6.0.2.tgz#157939134f20464e7301ddba3e90ffa8f7728ac5"
+  integrity sha512-cepbSq/neFK7xB6A50KHN0xHDotYzq58wWCa5LeWqnPrHG8GzfEjO/4O8kpmcGW+oaxkvhEJCWgbgNk4/ZV93Q==
   dependencies:
     figgy-pudding "^3.5.1"