README/getting-started: Update screenshot.

Fixes zulip#762.

README.md

@@ -9,7 +9,7 @@
 [![Coverage status](https://img.shields.io/codecov/c/github/zulip/zulip-terminal/master.svg)](https://app.codecov.io/gh/zulip/zulip-terminal/branch/master)
 [![Checked with mypy](http://www.mypy-lang.org/static/mypy_badge.svg)](http://mypy-lang.org/)
 
-![Screenshot 2020-05-19 at 9 56 49 AM](https://user-images.githubusercontent.com/56690786/82285402-0760b800-99b9-11ea-9a86-9d3765ea9177.png)
+![Screenshot](https://user-images.githubusercontent.com/9568999/106061037-b659a580-60a9-11eb-8ff8-ea1c54ac9084.png)
 
 ## About
 

docs/getting-started.md

@@ -8,7 +8,7 @@ If you encountered any issues above or have any queries, feel free to ask for he
 I would like you to try out a few of our keyboard shortcuts and send a couple message to help you get familiar with zulip terminal.
 
 #### What do you see?
-![Screenshot 2020-05-19 at 9 56 49 AM](https://user-images.githubusercontent.com/56690786/82285402-0760b800-99b9-11ea-9a86-9d3765ea9177.png)
+![Screenshot](https://user-images.githubusercontent.com/9568999/106061037-b659a580-60a9-11eb-8ff8-ea1c54ac9084.png)
 
 Zulip Terminal is divided into three columns/divisions.
 **The left column** shows list of all the streams you are subscribed to and some buttons for viewing different types of messages.