Update the minimum of package to get a build

I was not able to build the styleguide on my machine. This commit allows
me to get at least to http://127.0.0.1:8080/ to see some components.

Here are my specs:
```sh
robert@e480 ~> node --version
v12.7.0
robert@e480 ~> yarn --version
1.17.3
robert@e480 ~> cat /proc/version
Linux version 5.2.6-arch1-1-ARCH (builduser@heftig-3961) (gcc version 9.1.0 (GCC)) #1 SMP PREEMPT Sun Aug 4 14:58:49 UTC 2019
```

package.json

@@ -18,7 +18,7 @@
     "access": "public"
   },
   "dependencies": {
-    "vue": "^2.6.6"
+    "vue": "^2.6.10"
   },
   "devDependencies": {
     "@babel/core": "~7.2.2",
@@ -52,7 +52,7 @@
     "markdown-it-sub": "~1.0.0",
     "markdown-it-sup": "~1.0.0",
     "markdown-it-task-lists": "~2.1.1",
-    "node-sass": "~4.11.0",
+    "node-sass": "^4.12.0",
     "npm-run-all": "~4.1.5",
     "onchange": "~5.2.0",
     "portal-vue": "~1.5.1",
@@ -60,10 +60,10 @@
     "sass-loader": "~7.1.0",
     "theo": "~8.1.2",
     "vue-click-outside": "~1.0.7",
-    "vue-docgen-api": "~2.6.12",
+    "vue-docgen-api": "^3.20.0",
     "vue-router": "~3.0.2",
     "vue-svg-loader": "~0.12.0",
-    "vue-template-compiler": "^2.6.6",
+    "vue-template-compiler": "^2.6.10",
     "vuep": "git+https://github.com/visualjerk/vuep.git#fix-iframe-firefox",
     "webpack-bundle-analyzer": "~3.0.4",
     "webpack-merge-and-include-globally": "~2.1.14"
@@ -83,4 +83,4 @@
     "*.js"
   ],
   "license": "MIT"
-}
+}