Immediately reflect precision changes (kevinongko#44)

Fix kevinongko#45

Author: DesertSnow

dist/vue-numeric.min.js

@@ -288,6 +288,14 @@ export default {
     currency () {
       this.process(this.valueNumber)
       this.amount = this.format(this.valueNumber)
+    },
+
+    /**
+     * Immediately reflect precision changes
+     */
+    precision () {
+      this.process(this.valueNumber)
+      this.amount = this.format(this.valueNumber)
     }
   },
 

src/vue-numeric.vue

@@ -235,4 +235,10 @@ describe('vue-numeric.vue', () => {
     wrapper.setProps({ currency: 'USD' })
     expect(wrapper.data().amount).to.equal('USD 0')
   })
+
+  it('apply new precision immediately if it is changed', () => {
+    const wrapper = mount(VueNumeric, { propsData: { value: 2000.17, precision: 2 }})
+    wrapper.setProps({ precision: 1 })
+    expect(wrapper.data().amount).to.equal('2,000.2')
+  })
 })