fix(package): update bootstrap to version 4.1.0

Closes #13

Author: greenkeeper[bot]

package.json

@@ -24,7 +24,7 @@
   },
   "homepage": "https://github.com/escaleno-ltda/inspinia#readme",
   "dependencies": {
-    "bootstrap": "^3.3.7"
+    "bootstrap": "^4.1.0"
   },
   "devDependencies": {
     "copy": "^0.3.0",