Update impl/README.md

Co-authored-by: Ricardo Zanini <[email protected]>

Author: fjtirado

impl/README.md

@@ -174,7 +174,7 @@ We will send an event with a temperature that does not satisfy the criteria, so
  emitDefinition.instance(Map.of("temperature", 35)).start().join();
  ```
 
- Now its time to complete the waiting instance and send an event with the expected temperature. We do so by reusing `emitDefinition`.
+ It's time to complete the waiting instance and send an event with the expected temperature. We do so by reusing `emitDefinition`.
 
 ```java
  emitDefinition.instance(Map.of("temperature", 39)).start().join();