fix: update readme

Author: shaiMoria

README.md

@@ -8,7 +8,7 @@ Fluentd filter plugin to mask sensitive or privacy records with `*******` in pla
 ## Requirements
 | fluent-plugin-masking    | fluentd    | ruby   |
 | ---------------------    | ---------- | ------ |
-| 1.0.x                    | 	>= v0.14.0 | >= 2.1 |
+| 1.2.x                    | 	>= v0.14.0 | >= 2.5 |
 
 
 ## Installation
@@ -97,3 +97,11 @@ echo '{ :body => "{\"first_name\":\"mickey\", \"type\":\"puggle\", \"last_name\"
 ```
 2019-12-01 14:25:53.385681000 +0300 maskme: {"message":"{ :body => \"{\\\"first_name\\\":\\\"mickey\\\", \\\"type\\\":\\\"puggle\\\", \\\"last_name\\\":\\\"the-dog\\\", \\\"password\\\":\\\"*******\\\"}\"}"}
 ```
+
+
+### Run Unit Tests
+```
+gem install bundler
+bundle install
+ruby -r ./test/*.rb
+```