update d.ts

Author: icebob

.travis.yml

@@ -3,6 +3,8 @@ cache:
   directories:
   - node_modules
 node_js:
+    - "13"
+    - "12"
     - "10"
     - "8"
 after_success:

CHANGELOG.md

@@ -92,6 +92,8 @@ v.validate({ password: "123456", confirmPassword: "123456" }, schema); // Valid
 v.validate({ password: "123456", confirmPassword: "pass1234" }, schema); // Fail
 ```
 
+### `properties` in object rule
+You can use the `properties` property besides the `props` property in the object rule.
 
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