Lock down visual-review-tools version

Remove the caret from the visual-review-tools
version so that we don't accidentally
introduce bugs on new releases.

package.json

@@ -38,7 +38,7 @@
     "@babel/preset-env": "^7.5.5",
     "@gitlab/svgs": "^1.71.0",
     "@gitlab/ui": "5.20.1",
-    "@gitlab/visual-review-tools": "^1.0.0",
+    "@gitlab/visual-review-tools": "1.0.0",
     "apollo-cache-inmemory": "^1.5.1",
     "apollo-client": "^2.5.1",
     "apollo-link": "^1.2.11",

yarn.lock

@@ -1014,7 +1014,7 @@
     vue "^2.6.10"
     vue-loader "^15.4.2"
 
-"@gitlab/visual-review-tools@^1.0.0":
+"@gitlab/visual-review-tools@1.0.0":
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/@gitlab/visual-review-tools/-/visual-review-tools-1.0.0.tgz#6012e0a19797c1f5dad34ccf4dacdaf38e400a73"
   integrity sha512-xMvz9IwrXisQ1MH+Tj6lfbQcQSiQy88nTPuQV6OTLBGuV+vIQeVwXeIkQeTKuSpd0GqZvigPdRqxyQCa3blpIg==