fix README versioning info and test for php 7.3.21

Author: fabiodcorreia

README.md

@@ -36,7 +36,7 @@ This image follows the [Semantic Versioning](https://semver.org/) pattern.
 | Version        | 1.0      | 1.1      | 2.0     |
 | :----:         | ---      | ---      | ----    |
 | Base Image     | 1.x.x    | 1.x.x    | 2.x.x   |
-| PHP            | 7.3.19   | 7.3.20   | 7.3.19  |
+| PHP            | 7.3.19   | 7.4.10   | 7.3.19  |
 
 When Base Image gets upgraded the major version is incremented, when PHP gets upgraded the minor version is incremented.
 

test/main.py

@@ -15,4 +15,4 @@
 
 response = br.open(APP_TEST_URL)
 assert response.code == 200, "response code is not 200"
-assert br.title() == "PHP 7.3.20 - phpinfo()", "found: " + br.title()
+assert br.title() == "PHP 7.3.21 - phpinfo()", "found: " + br.title()