Icon add color prop

Icon add color prop

src/components/icon/icon.vue

@@ -7,20 +7,25 @@
     export default {
         props: {
             type: String,
-            size: [Number, String]
+            size: [Number, String],
+            color: String
         },
         computed: {
             classes () {
                 return `${prefixCls} ${prefixCls}-${this.type}`
             },
             styles () {
+                let style = {};
+
                 if (!!this.size) {
-                    return {
-                        'font-size': `${this.size}px`
-                    }
-                } else {
-                    return {}
+                    style['font-size'] = `${this.size}px`;
                 }
+
+                if (!!this.color) {
+                    style.color = this.color;
+                }
+
+                return style;
             }
         }
     }