Fix missing checkmark

Author: repo-matic

readme.md

@@ -729,7 +729,7 @@ Learn and practice [TDD principles](https://www.sm-cloud.com/book-review-test-dr
 
 ## ⚪ ️2.1 Enrich your testing portfolio: Look beyond unit tests and the pyramid
 
-:white*check_mark: **Do:** The [testing pyramid](https://martinfowler.com/bliki/TestPyramid.html), though 10> years old, is a great and relevant model that suggests three testing types and influences most developers’ testing strategy. At the same time, more than a handful of shiny new testing techniques emerged and are hiding in the shadows of the testing pyramid. Given all the dramatic changes that we’ve seen in the recent 10 years (Microservices, cloud, serverless), is it even possible that one quite-old model will suit \_all* types of applications? shouldn’t the testing world consider welcoming new testing techniques?
+:white_check_mark: **Do:** The [testing pyramid](https://martinfowler.com/bliki/TestPyramid.html), though 10> years old, is a great and relevant model that suggests three testing types and influences most developers’ testing strategy. At the same time, more than a handful of shiny new testing techniques emerged and are hiding in the shadows of the testing pyramid. Given all the dramatic changes that we’ve seen in the recent 10 years (Microservices, cloud, serverless), is it even possible that one quite-old model will suit \_all* types of applications? shouldn’t the testing world consider welcoming new testing techniques?
 
 Don’t get me wrong, in 2019 the testing pyramid, TDD and unit tests are still a powerful technique and are probably the best match for many applications. Only like any other model, despite its usefulness, [it must be wrong sometimes](https://en.wikipedia.org/wiki/All_models_are_wrong). For example, consider an IOT application that ingests many events into a message-bus like Kafka/RabbitMQ, which then flow into some data-warehouse and are eventually queried by some analytics UI. Should we really spend 50% of our testing budget on writing unit tests for an application that is integration-centric and has almost no logic? As the diversity of application types increase (bots, crypto, Alexa-skills) greater are the chances to find scenarios where the testing pyramid is not the best match.