Update readme.md

Author: Taras

lambdas/readme.md

@@ -2,7 +2,7 @@
 
 This is the tutorial on lambdas, method reference, and functional interfaces. 
 ### Pre-conditions
-You're suppose to be familiar with OOP, have basic knowladge of JDK, and be able to write Java code. 
+You're supposed to be familiar with OOP, have basic knowledge of JDK, and be able to write Java code. 
 ### Related exercises
 * [Math fucntions factory](https://github.com/bobocode-projects/java-8-exercises/tree/master/math-functions-factory)
 ### See also