doc: caching and expire time added to readme

CHANGELOG.md

@@ -18,9 +18,9 @@
 
 * isCalculating option on dependsOnAsync.
 
-
-# 1.3.0
+# 1.3.1
 
 * bugfix: prevent updating holden when other calculate is running.
 * caching.
-* caching expire time.
+* caching expire time.
+* add document to readme.

README.md

@@ -77,7 +77,7 @@ And state will get update automatically without calling setState
 # Other features:
 
 ### Depends on:
-Telescopes can be depended on other telescopes
+Telescopes can be depended on other telescopes.
 
 ```dart
 var height = Telescope(186);
@@ -95,13 +95,27 @@ var showingText  = Telescope.dependsOn([bmi], () {
 So when ever height or weight value get changes, the bmi will calculate itself because it depends on height and weight.<br>
 And showingText will calculate itself too, because it depends on bmi.
 
+<br>
+
 #### Async way:
 ```dart
 var bmi = Telescope.dependsOnAsync(0, [height, weight], () async {
   return await calculateBMI(height.value, weight.value);
 });
 ```
 
+<br>
+
+#### Caching:
+```dart
+var bmi = Telescope.dependsOnAsync(0, [height, weight], () async {
+   return await calculateBMI(height.value, weight.value);
+}, enableCaching: true);
+```
+You can also set expire time by passing <b>cacheExpireTime</b>.
+
+<br>
+
 #### Observable on loading state:
 This will make <b>isCalculatingBMI</b> true on loading and false when loaded, you may need this to show loading animation.
 ```dart