Merge branch 'leipert-forward-bootstrap4' into 'master'

Update bootstrap to 4.1.1

See merge request gitlab-org/gitlab-ce!19179

package.json

@@ -25,7 +25,7 @@
     "babel-preset-latest": "^6.24.1",
     "babel-preset-stage-2": "^6.24.1",
     "blackst0ne-mermaid": "^7.1.0-fixed",
-    "bootstrap": "4.1",
+    "bootstrap": "~4.1.1",
     "brace-expansion": "^1.1.8",
     "cache-loader": "^1.2.2",
     "chart.js": "1.0.2",

yarn.lock

@@ -1274,9 +1274,9 @@ boom@5.x.x:
   dependencies:
     hoek "4.x.x"
 
-bootstrap@4.1:
-  version "4.1.0"
-  resolved "https://registry.yarnpkg.com/bootstrap/-/bootstrap-4.1.0.tgz#110b05c31a236d56dbc9adcda6dd16f53738a28a"
+bootstrap@~4.1.1:
+  version "4.1.1"
+  resolved "https://registry.yarnpkg.com/bootstrap/-/bootstrap-4.1.1.tgz#3aec85000fa619085da8d2e4983dfd67cf2114cb"
 
 boxen@^1.2.1:
   version "1.3.0"