docs: update installation version in README.md (#86)

diff --git a/README.md b/README.md
index 3372a3f..d11972c 100644
--- a/README.md
+++ b/README.md
@@ -108,7 +108,7 @@
 
 ```yaml
 dependencies:
-  equatable: ^1.2.3
+  equatable: ^1.2.5
 ```
 
 Next, we need to install it: