Update README.md

Author: TikhomirovSergey

README.md

@@ -20,6 +20,8 @@ This is the Java language binding for writing Appium Tests, conforms to [Mobile
 ## Changelog
 
 *5.0.0 (under construction yet)*
+
+*5.0.0-BETA7*
 - **[ENHANCEMENT]** The ability to customize the polling strategy of the waiting was provided. [#612](https://github.com/appium/java-client/pull/612) 
 - **[ENHANCEMENT]** **[REFACTOR]** Methods which were representing time deltas instead of elementary types became `Deprecated`. Methods which use `java.time.Duration` are suugested to be used. [#611](https://github.com/appium/java-client/pull/611)
 - **[ENHANCEMENT]** The ability to calculate screenshots overlap was included. [#595](https://github.com/appium/java-client/pull/595).