chore: dependencies update

- chore: update `@coreui/coreui` to `^2.1.5`
- chore: update `@coreui/vue` to `^2.1.1`
- chore: update `bootstrap` to `^4.2.1`
- chore: update `core-js` to `^2.6.1`
- chore: update `css-vars-ponyfill` to `^1.16.2`
- chore: update `vue` to `^2.5.21`
- chore: update `@vue/cli-plugin-babel` to `^3.3.0`
- chore: update `@vue/cli-plugin-e2e-nightwatch` to `^3.3.0`
- chore: update `@vue/cli-plugin-eslint` to `^3.3.0`
- chore: update `@vue/cli-plugin-unit-jest` to `^3.3.0`
- chore: update `@vue/cli-service` to `^3.3.0`
- chore: update `@vue/test-utils` to `^1.0.0-beta.28`
- chore: update `vue-template-compiler` to `^2.5.21`

Author: xidedix

package.json

@@ -14,38 +14,38 @@
     "test:e2e": "vue-cli-service test:e2e"
   },
   "dependencies": {
-    "@coreui/coreui": "^2.1.4",
+    "@coreui/coreui": "^2.1.5",
     "@coreui/coreui-plugin-chartjs-custom-tooltips": "^1.2.0",
     "@coreui/icons": "0.3.0",
-    "@coreui/vue": "^2.1.0",
-    "bootstrap": "^4.1.3",
+    "@coreui/vue": "^2.1.1",
+    "bootstrap": "^4.2.1",
     "bootstrap-vue": "^2.0.0-rc.11",
     "chart.js": "^2.7.3",
-    "core-js": "^2.6.0",
-    "css-vars-ponyfill": "^1.15.3",
+    "core-js": "^2.6.1",
+    "css-vars-ponyfill": "^1.16.2",
     "flag-icon-css": "^3.2.0",
     "font-awesome": "^4.7.0",
     "perfect-scrollbar": "^1.4.0",
     "simple-line-icons": "^2.4.1",
-    "vue": "^2.5.19",
+    "vue": "^2.5.21",
     "vue-chartjs": "^3.4.0",
     "vue-perfect-scrollbar": "^0.1.0",
     "vue-router": "^3.0.2"
   },
   "devDependencies": {
-    "@vue/cli-plugin-babel": "^3.2.0",
-    "@vue/cli-plugin-e2e-nightwatch": "^3.2.0",
-    "@vue/cli-plugin-eslint": "^3.2.1",
-    "@vue/cli-plugin-unit-jest": "^3.2.0",
-    "@vue/cli-service": "^3.2.0",
-    "@vue/test-utils": "^1.0.0-beta.27",
+    "@vue/cli-plugin-babel": "^3.3.0",
+    "@vue/cli-plugin-e2e-nightwatch": "^3.3.0",
+    "@vue/cli-plugin-eslint": "^3.3.0",
+    "@vue/cli-plugin-unit-jest": "^3.3.0",
+    "@vue/cli-service": "^3.3.0",
+    "@vue/test-utils": "^1.0.0-beta.28",
     "babel-core": "^7.0.0-bridge.0",
     "babel-jest": "^23.6.0",
     "growl": "^1.10.5",
     "https-proxy-agent": "^2.2.1",
     "node-sass": "^4.11.0",
     "sass-loader": "^7.1.0",
-    "vue-template-compiler": "^2.5.19"
+    "vue-template-compiler": "^2.5.21"
   },
   "browserslist": [
     "> 1%",