Explicitly use bootstrap 4.1.1

package.json

@@ -28,7 +28,7 @@
     "babel-preset-latest": "^6.24.1",
     "babel-preset-stage-2": "^6.24.1",
     "blackst0ne-mermaid": "^7.1.0-fixed",
-    "bootstrap": "~4.1.1",
+    "bootstrap": "4.1.1",
     "brace-expansion": "^1.1.8",
     "cache-loader": "^1.2.2",
     "chart.js": "1.0.2",

yarn.lock

@@ -1268,9 +1268,13 @@ bootstrap-vue@^2.0.0-rc.11:
     popper.js "^1.12.9"
     vue-functional-data-merge "^2.0.5"
 
-bootstrap@^4.1.1, bootstrap@~4.1.1:
-  version "4.1.2"
-  resolved "https://registry.yarnpkg.com/bootstrap/-/bootstrap-4.1.2.tgz#aee2a93472e61c471fc79fb475531dcbc87de326"
+bootstrap@4.1.1:
+  version "4.1.1"
+  resolved "https://registry.yarnpkg.com/bootstrap/-/bootstrap-4.1.1.tgz#3aec85000fa619085da8d2e4983dfd67cf2114cb"
+
+bootstrap@^4.1.1:
+  version "4.1.3"
+  resolved "https://registry.yarnpkg.com/bootstrap/-/bootstrap-4.1.3.tgz#0eb371af2c8448e8c210411d0cb824a6409a12be"
 
 boxen@^1.2.1:
   version "1.3.0"