Update readme.md

Author: Taras

lambdas/readme.md

@@ -1,10 +1,10 @@
 # <img src="https://raw.githubusercontent.com/bobocode-projects/resources/master/image/logo_transparent_background.png" height=50/> Lambdas tutorial
 
 This is the tutorial on lambdas, method reference, and functional interfaces. 
-### Pre-conditions
+### Pre-conditions :heavy_exclamation_mark:
 You're supposed to be familiar with OOP, have basic knowledge of JDK, and be able to write Java code. 
-### Related exercises
+### Related exercises :muscle:
 * [Math fucntions factory](https://github.com/bobocode-projects/java-8-exercises/tree/master/math-functions-factory)
-### See also
+### See also :point_down:
 * [Tutorial on Optional](https://github.com/bobocode-projects/java-8-tutorial/tree/master/optional)
 * [Tutorial on Stream API](https://github.com/bobocode-projects/java-8-tutorial/tree/master/stream-api)