docs: fix style (#547)

Signed-off-by: Jan Kowalleck <[email protected]>

Author: jkowalleck

README.md

@@ -12,7 +12,7 @@
 
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-It is a plugin for PHP's _[Composer](https://getcomposer.org/)_that generates Software Bill of Materials (SBOM) in _[CycloneDX](https://cyclonedx.org/)_ format.  
+It is a plugin for PHP's [_Composer_](https://getcomposer.org/) that generates Software Bill of Materials (SBOM) in _[CycloneDX](https://cyclonedx.org/)_ format.  
 This is probably the most accurate, complete SBOM generator for Composer-based PHP projects.  
 
 Based on [OWASP Software Component Verification Standard for Software Bill of Materials](https://scvs.owasp.org/scvs/v2-software-bill-of-materials/)'s