added "options" to VFG install function, appending custom "validators…

…" to the validators object that are passed into `Vue.use(VueFormGenerator, { validators: { key: (value, field, model) => {} })

src/index.js

@@ -3,8 +3,13 @@ const schema = require("./utils/schema.js");
 const validators = require("./utils/validators.js").default;
 const fieldComponents = require("./utils/fieldsLoader").default;
 const abstractField = require("./fields/abstractField").default;
-const install = (Vue) => {
+const install = (Vue, options) => {
 	Vue.component("VueFormGenerator", module.exports.component);
+	if(options && options.validators) {
+		for(let key in options.validators) {
+			validators[key] = options.validators[key];
+		}
+	}
 };
 
 module.exports = {