chore: remove bower.json

bower.json

@@ -1,18 +0,0 @@
-{
-  "name": "vuex",
-  "main": "dist/vuex.js",
-  "description": "state management for Vue.js",
-  "authors": "Evan You",
-  "license": "MIT",
-  "ignore": [
-    "examples",
-    "test",
-    "docs",
-    ".gitignore",
-    ".eslintrc",
-    ".babelrc",
-    "*.json",
-    "*.md",
-    "*.yml"
-  ]
-}