Update package.json

Fix dev dependencies
Add peer dependency on vue
Add missing keys to remove warnings

package.json

@@ -1,7 +1,13 @@
 {
   "name": "vue-datocms",
   "version": "0.0.4",
-  "description": "",
+  "description": "A set of components and utilities to work faster with DatoCMS in Vue.js environments",
+  "keywords": [
+    "datocms",
+    "vue.js",
+    "vue",
+    "vuejs"
+  ],
   "main": "dist/vue-datocms.umd.js",
   "module": "dist/vue-datocms.esm.js",
   "unpkg": "dist/vue-datocms.min.js",
@@ -18,7 +24,10 @@
   },
   "license": "MIT",
   "author": "Stefano Verna <s.verna@datocms.com>",
+  "contributors": [],
   "homepage": "https://github.com/datocms/vue-datocms",
+  "bugs": "https://github.com/datocms/vue-datocms/issues",
+  "repository": "github:datocms/vue-datocms",
   "devDependencies": {
     "@babel/preset-env": "^7.8.7",
     "@vue/babel-preset-jsx": "^1.1.2",
@@ -36,12 +45,18 @@
     "rollup": "^2.0.6",
     "rollup-plugin-buble": "^0.19.8",
     "rollup-plugin-commonjs": "^10.1.0",
+    "rollup-plugin-babel": "^4.4.0",
     "rollup-plugin-vue": "^5.1.6",
     "vue-template-compiler": "^2.6.11"
   },
   "dependencies": {
-    "@znck/prop-types": "^0.6.3",
-    "rollup-plugin-babel": "^4.4.0"
+    "@znck/prop-types": "^0.6.3"
+  },
+  "peerDependencies": {
+    "vue": "^2.6.0"
+  },
+  "engines": {
+    "node": ">=12"
   },
   "jest": {
     "moduleFileExtensions": [