Fix formatting in version history table

Author: arhimede

README.md

@@ -10,7 +10,7 @@ Documentation is available at: https://docs.dotkernel.org/dot-mail/.
 
 ## Version History
 
-| Branch | Release   | PSR-11 Container        | Mailer Implementation | OSS Lifecycle         | PHP Version                                                                                               |
+| Branch | Release   | PSR-11  | Mailer Implementation | OSS Lifecycle         | PHP Version                                                                                               |
 |--------|-----------|------------------------|-----------------------|-----------------------|-----------------------------------------------------------------------------------------------------------|
 | 5.2    | >= 5.2.0  | 1 \|\| 2 | `symfony/mailer`        | ![OSS Lifecycle](https://img.shields.io/osslifecycle?file_url=https%3A%2F%2Fgithub.com%2Fdotkernel%2Fdot-mail%2Fblob%2F5.2%2FOSSMETADATA) | ![PHP from Packagist (specify version)](https://img.shields.io/packagist/php-v/dotkernel/dot-mail/5.4.0) |
 | 5.1    | < 5.2.0   | 1     | `symfony/mailer`        | ![OSS Lifecycle](https://img.shields.io/osslifecycle?file_url=https%3A%2F%2Fgithub.com%2Fdotkernel%2Fdot-mail%2Fblob%2F5.1%2FOSSMETADATA) | ![PHP from Packagist (specify version)](https://img.shields.io/packagist/php-v/dotkernel/dot-mail/5.1.6) |